Rename 'with parallel' to 'with interleave' (#265).

artiq/compiler/builtins.py

@@ -144,8 +144,8 @@ def fn_print():
 def fn_kernel():
     return types.TBuiltinFunction("kernel")
 
-def obj_parallel():
+def obj_interleave():
-    return types.TBuiltin("parallel")
+    return types.TBuiltin("interleave")
 
 def obj_sequential():
     return types.TBuiltin("sequential")

artiq/compiler/ir.py

@@ -1418,7 +1418,7 @@ class Loop(Terminator):
     def opcode(self):
         return "loop({} times)".format(self.trip_count)
 
-class Parallel(Terminator):
+class Interleave(Terminator):
     """
     An instruction that schedules several threads of execution
     in parallel.
@@ -1428,7 +1428,7 @@ class Parallel(Terminator):
         super().__init__(destinations, builtins.TNone(), name)
 
     def opcode(self):
-        return "parallel"
+        return "interleave"
 
     def destinations(self):
         return self.operands

artiq/compiler/prelude.py

@@ -30,7 +30,7 @@ def globals():
         "portable":             builtins.fn_kernel(),
 
         # ARTIQ context managers
-        "parallel":             builtins.obj_parallel(),
+        "interleave":           builtins.obj_interleave(),
         "sequential":           builtins.obj_sequential(),
         "watchdog":             builtins.fn_watchdog(),
 

artiq/compiler/transforms/artiq_ir_generator.py

@@ -747,8 +747,8 @@ class ARTIQIRGenerator(algorithm.Visitor):
         if types.is_builtin(context_expr_node.type, "sequential"):
             self.visit(node.body)
             return
-        elif types.is_builtin(context_expr_node.type, "parallel"):
+        elif types.is_builtin(context_expr_node.type, "interleave"):
-            parallel = self.append(ir.Parallel([]))
+            interleave = self.append(ir.Interleave([]))
 
             heads, tails = [], []
             for stmt in node.body:
@@ -758,7 +758,7 @@ class ARTIQIRGenerator(algorithm.Visitor):
                 tails.append(self.current_block)
 
             for head in heads:
-                parallel.add_destination(head)
+                interleave.add_destination(head)
 
             self.current_block = self.add_block()
             for tail in tails:

artiq/compiler/transforms/inferencer.py

@@ -993,7 +993,7 @@ class Inferencer(algorithm.Visitor):
         self.generic_visit(node)
 
         typ = node.context_expr.type
-        if (types.is_builtin(typ, "parallel") or types.is_builtin(typ, "sequential") or
+        if (types.is_builtin(typ, "interleave") or types.is_builtin(typ, "sequential") or
                 (isinstance(node.context_expr, asttyped.CallT) and
                  types.is_builtin(node.context_expr.func.type, "watchdog"))):
             # builtin context managers
@@ -1092,7 +1092,7 @@ class Inferencer(algorithm.Visitor):
 
         for item_node in node.items:
             typ = item_node.context_expr.type.find()
-            if (types.is_builtin(typ, "parallel") or types.is_builtin(typ, "sequential")) and \
+            if (types.is_builtin(typ, "interleave") or types.is_builtin(typ, "sequential")) and \
                     len(node.items) != 1:
                 diag = diagnostic.Diagnostic("error",
                     "the '{kind}' context manager must be the only one in a 'with' statement",

artiq/compiler/transforms/interleaver.py

@@ -66,7 +66,7 @@ class Interleaver:
 
         postdom_tree = None
         for insn in func.instructions():
-            if not isinstance(insn, ir.Parallel):
+            if not isinstance(insn, ir.Interleave):
                 continue
 
             # Lazily compute dominators.
@@ -79,7 +79,7 @@ class Interleaver:
             source_times  = [0 for _ in source_blocks]
 
             if len(source_blocks) == 1:
-                # Immediate dominator for a parallel instruction with one successor
+                # Immediate dominator for a interleave instruction with one successor
                 # is the first instruction in the body of the statement which created
                 # it, but below we expect that it would be the first instruction after
                 # the statement itself.
@@ -87,7 +87,7 @@ class Interleaver:
                 continue
 
             interleave_until = postdom_tree.immediate_dominator(insn.basic_block)
-            assert interleave_until is not None # no nonlocal flow in `with parallel`
+            assert interleave_until is not None # no nonlocal flow in `with interleave`
             assert interleave_until not in source_blocks
 
             while len(source_blocks) > 0:
@@ -111,7 +111,7 @@ class Interleaver:
                 assert target_time_delta >= 0
 
                 target_terminator = target_block.terminator()
-                if isinstance(target_terminator, ir.Parallel):
+                if isinstance(target_terminator, ir.Interleave):
                     target_terminator.replace_with(ir.Branch(source_block))
                 elif isinstance(target_terminator, (ir.Delay, ir.Branch)):
                     target_terminator.set_target(source_block)
@@ -119,7 +119,7 @@ class Interleaver:
                     assert False
 
                 source_terminator = source_block.terminator()
-                if isinstance(source_terminator, ir.Parallel):
+                if isinstance(source_terminator, ir.Interleave):
                     source_terminator.replace_with(ir.Branch(source_terminator.target()))
                 elif isinstance(source_terminator, ir.Branch):
                     pass
@@ -149,7 +149,7 @@ class Interleaver:
                             if old_decomp.static_target_function is None:
                                 diag = diagnostic.Diagnostic("fatal",
                                     "it is not possible to interleave this function call within "
-                                    "a 'with parallel:' statement because the compiler could not "
+                                    "a 'with interleave:' statement because the compiler could not "
                                     "prove that the same function would always be called", {},
                                     old_decomp.loc)
                                 self.engine.process(diag)

artiq/compiler/transforms/iodelay_estimator.py

@@ -219,7 +219,7 @@ class IODelayEstimator(algorithm.Visitor):
         self.visit(node.items)
 
         context_expr = node.items[0].context_expr
-        if len(node.items) == 1 and types.is_builtin(context_expr.type, "parallel"):
+        if len(node.items) == 1 and types.is_builtin(context_expr.type, "interleave"):
             try:
                 delays = []
                 for stmt in node.body:
@@ -235,7 +235,7 @@ class IODelayEstimator(algorithm.Visitor):
                 # since there's no chance that the code will never actually execute
                 # inside a `with` statement after all.
                 note = diagnostic.Diagnostic("note",
-                    "while interleaving this 'with parallel:' statement", {},
+                    "while interleaving this 'with interleave:' statement", {},
                     node.loc)
                 error.cause.notes += [note]
                 self.engine.process(error.cause)
@@ -249,11 +249,11 @@ class IODelayEstimator(algorithm.Visitor):
             if flow_stmt is not None:
                 note = diagnostic.Diagnostic("note",
                     "this '{kind}' statement transfers control out of "
-                    "the 'with parallel:' statement",
+                    "the 'with interleave:' statement",
                     {"kind": flow_stmt.keyword_loc.source()},
                     flow_stmt.loc)
                 diag = diagnostic.Diagnostic("error",
-                    "cannot interleave this 'with parallel:' statement", {},
+                    "cannot interleave this 'with interleave:' statement", {},
                     node.keyword_loc.join(node.colon_loc), notes=[note])
                 self.engine.process(diag)
 

artiq/language/core.py

@@ -13,7 +13,7 @@ __all__ = ["host_int", "int", "host_round", "round",
 
 # global namespace for kernels
 kernel_globals = (
-    "sequential", "parallel",
+    "sequential", "parallel", "interleave",
     "delay_mu", "now_mu", "at_mu", "delay",
     "seconds_to_mu", "mu_to_seconds",
     "watchdog"
@@ -264,7 +264,7 @@ _time_manager = _DummyTimeManager()
 def set_time_manager(time_manager):
     """Set the time manager used for simulating kernels by running them
     directly inside the Python interpreter. The time manager responds to the
-    entering and leaving of parallel/sequential blocks, delays, etc. and
+    entering and leaving of interleave/parallel/sequential blocks, delays, etc. and
     provides a time-stamped logging facility for events.
     """
     global _time_manager
@@ -288,7 +288,7 @@ class _Parallel:
 
     The execution time of a parallel block is the execution time of its longest
     statement. A parallel block may contain sequential blocks, which themselves
-    may contain parallel blocks, etc.
+    may contain interleave blocks, etc.
     """
     def __enter__(self):
         _time_manager.enter_parallel()
@@ -296,7 +296,7 @@ class _Parallel:
     def __exit__(self, type, value, traceback):
         _time_manager.exit()
 parallel = _Parallel()
-
+interleave = _Parallel() # no difference in semantics on host
 
 def delay_mu(duration):
     """Increases the RTIO time by the given amount (in machine units)."""

artiq/test/coredevice/test_analyzer.py

@@ -12,7 +12,7 @@ class CreateTTLPulse(EnvExperiment):
     def run(self):
         self.ttl_inout.output()
         delay_mu(100)
-        with parallel:
+        with interleave:
             self.ttl_inout.gate_both_mu(1200)
             with sequential:
                 delay_mu(100)

artiq/test/coredevice/test_portability.py

@@ -100,7 +100,7 @@ class _Pulses(EnvExperiment):
     @kernel
     def run(self):
         for i in range(3):
-            with parallel:
+            with interleave:
                 with sequential:
                     self.a.pulse(100+i, 20*us)
                     self.b.pulse(200+i, 20*us)

artiq/test/coredevice/test_rtio.py

@@ -16,7 +16,7 @@ class RTT(EnvExperiment):
     def run(self):
         self.ttl_inout.output()
         delay(1*us)
-        with parallel:
+        with interleave:
             # make sure not to send two commands into the same RTIO
             # channel with the same timestamp
             self.ttl_inout.gate_rising(5*us)
@@ -37,7 +37,7 @@ class Loopback(EnvExperiment):
     def run(self):
         self.loop_in.input()
         delay(1*us)
-        with parallel:
+        with interleave:
             self.loop_in.gate_rising(2*us)
             with sequential:
                 delay(1*us)
@@ -57,7 +57,7 @@ class ClockGeneratorLoopback(EnvExperiment):
         self.loop_clock_in.input()
         self.loop_clock_out.stop()
         delay(1*us)
-        with parallel:
+        with interleave:
             self.loop_clock_in.gate_rising(10*us)
             with sequential:
                 delay(200*ns)
@@ -110,7 +110,7 @@ class LoopbackCount(EnvExperiment):
     def run(self):
         self.ttl_inout.output()
         delay(5*us)
-        with parallel:
+        with interleave:
             self.ttl_inout.gate_rising(10*us)
             with sequential:
                 for i in range(self.npulses):

artiq/test/lit/inferencer/error_with_many.py

@@ -1,6 +1,6 @@
 # RUN: %python -m artiq.compiler.testbench.inferencer +diag %s >%t
 # RUN: OutputCheck %s --file-to-check=%t
 
-# CHECK-L: ${LINE:+1}: error: the 'parallel' context manager must be the only one in a 'with' statement
+# CHECK-L: ${LINE:+1}: error: the 'interleave' context manager must be the only one in a 'with' statement
-with parallel, sequential:
+with interleave, sequential:
     pass

artiq/test/lit/inferencer/with.py

@@ -2,4 +2,4 @@
 # RUN: OutputCheck %s --file-to-check=%t
 
 # CHECK-L: as x:NoneType
-with parallel as x: pass
+with interleave as x: pass

artiq/test/lit/interleaving/control_flow.py

@@ -2,7 +2,7 @@
 # RUN: OutputCheck %s --file-to-check=%t
 
 def f():
-    with parallel:
+    with interleave:
         if True:
             print(1)
         else:

artiq/test/lit/interleaving/error_inlining.py

@@ -10,7 +10,7 @@ def g():
 x = f if True else g
 
 def h():
-    with parallel:
+    with interleave:
         f()
-        # CHECK-L: ${LINE:+1}: fatal: it is not possible to interleave this function call within a 'with parallel:' statement because the compiler could not prove that the same function would always be called
+        # CHECK-L: ${LINE:+1}: fatal: it is not possible to interleave this function call within a 'with interleave:' statement because the compiler could not prove that the same function would always be called
         x()

artiq/test/lit/interleaving/error_toplevel_control_flow.py

@@ -2,16 +2,16 @@
 # RUN: OutputCheck %s --file-to-check=%t
 
 def f():
-    # CHECK-L: ${LINE:+1}: error: cannot interleave this 'with parallel:' statement
+    # CHECK-L: ${LINE:+1}: error: cannot interleave this 'with interleave:' statement
-    with parallel:
+    with interleave:
-        # CHECK-L: ${LINE:+1}: note: this 'return' statement transfers control out of the 'with parallel:' statement
+        # CHECK-L: ${LINE:+1}: note: this 'return' statement transfers control out of the 'with interleave:' statement
         return
         delay(1.0)
 
 def g():
     while True:
-        # CHECK-L: ${LINE:+1}: error: cannot interleave this 'with parallel:' statement
+        # CHECK-L: ${LINE:+1}: error: cannot interleave this 'with interleave:' statement
-        with parallel:
+        with interleave:
-            # CHECK-L: ${LINE:+1}: note: this 'break' statement transfers control out of the 'with parallel:' statement
+            # CHECK-L: ${LINE:+1}: note: this 'break' statement transfers control out of the 'with interleave:' statement
             break
             delay(1.0)

artiq/test/lit/interleaving/indirect.py

@@ -5,7 +5,7 @@ def f():
     delay_mu(2)
 
 def g():
-    with parallel:
+    with interleave:
         with sequential:
             print("A", now_mu())
             f()

artiq/test/lit/interleaving/indirect_arg.py

@@ -5,7 +5,7 @@ def f(n):
     delay_mu(n)
 
 def g():
-    with parallel:
+    with interleave:
         with sequential:
             print("A", now_mu())
             f(2)

artiq/test/lit/interleaving/nonoverlapping.py

@@ -2,7 +2,7 @@
 # RUN: OutputCheck %s --file-to-check=%t
 
 def g():
-    with parallel:
+    with interleave:
         with sequential:
             print("A", now_mu())
             delay_mu(2)

artiq/test/lit/interleaving/overlapping.py

@@ -2,7 +2,7 @@
 # RUN: OutputCheck %s --file-to-check=%t
 
 def g():
-    with parallel:
+    with interleave:
         with sequential:
             print("A", now_mu())
             delay_mu(3)

artiq/test/lit/interleaving/pure_impure_tie.py

@@ -5,7 +5,7 @@ def f():
     delay_mu(2)
 
 def g():
-    with parallel:
+    with interleave:
         f()
         delay_mu(2)
     print(now_mu())

artiq/test/lit/interleaving/unrolling.py

@@ -1,7 +1,7 @@
 # RUN: %python -m artiq.compiler.testbench.jit %s >%t
 # RUN: OutputCheck %s --file-to-check=%t
 
-with parallel:
+with interleave:
     for x in range(10):
         delay_mu(1)
         print("a", x)

artiq/test/lit/iodelay/error_bad_interleave.py

@@ -2,7 +2,7 @@
 # RUN: OutputCheck %s --file-to-check=%t
 
 def f():
-    with parallel:
+    with interleave:
         # CHECK-L: ${LINE:+1}: error: while statement cannot be interleaved
         while True:
             delay_mu(1)

artiq/test/lit/iodelay/interleave.py

@@ -3,13 +3,13 @@
 
 # CHECK-L: f: (a:int(width=64), b:int(width=64))->NoneType delay(max(a, b) mu)
 def f(a, b):
-    with parallel:
+    with interleave:
         delay_mu(a)
         delay_mu(b)
 
 # CHECK-L: g: (a:int(width=64))->NoneType delay(max(a, 200) mu)
 def g(a):
-    with parallel:
+    with interleave:
         delay_mu(100)
         delay_mu(200)
         delay_mu(a)

artiq/test/lit/local_access/parallel.py

@@ -1,6 +1,6 @@
 # RUN: %python -m artiq.compiler.testbench.signature %s >%t
 
-with parallel:
+with interleave:
     delay(1.0)
     t0 = now_mu()
 print(t0)

doc/manual/getting_started_core.rst

@@ -156,23 +156,23 @@ The core device records the real-time IO waveforms into a circular buffer. It is
 
 Afterwards, the recorded data can be extracted and written to a VCD file using ``artiq_coreanalyzer -w rtio.vcd`` (see: :ref:`core-device-rtio-analyzer-tool`). VCD files can be viewed using third-party tools such as GtkWave.
 
-Parallel and sequential blocks
+Interleave and sequential blocks
-------------------------------
+--------------------------------
 
-It is often necessary that several pulses overlap one another. This can be expressed through the use of ``with parallel`` constructs, in which all statements execute at the same time. The execution time of the ``parallel`` block is the execution time of its longest statement.
+It is often necessary that several pulses overlap one another. This can be expressed through the use of ``with interleave`` constructs, in which all statements execute at the same time. The execution time of the ``interleave`` block is the execution time of its longest statement.
 
 Try the following code and observe the generated pulses on a 2-channel oscilloscope or logic analyzer: ::
 
     for i in range(1000000):
-        with parallel:
+        with interleave:
             self.ttl0.pulse(2*us)
             self.ttl1.pulse(4*us)
         delay(4*us)
 
-Within a parallel block, some statements can be made sequential again using a ``with sequential`` construct. Observe the pulses generated by this code: ::
+Within a interleave block, some statements can be made sequential again using a ``with sequential`` construct. Observe the pulses generated by this code: ::
 
     for i in range(1000000):
-        with parallel:
+        with interleave:
             with sequential:
                 self.ttl0.pulse(2*us)
                 delay(1*us)
@@ -181,4 +181,4 @@ Within a parallel block, some statements can be made sequential again using a ``
         delay(4*us)
 
 .. warning::
-    In its current implementation, ARTIQ only supports those pulse sequences that can be interleaved at compile time into a sequential series of on/off events. Combinations of ``parallel``/``sequential`` blocks that require multithreading (due to the parallel execution of long loops, complex algorithms, or algorithms that depend on external input) will cause the compiler to return an error.
+    In its current implementation, ARTIQ only supports those pulse sequences that can be interleaved at compile time into a sequential series of on/off events. Combinations of ``interleave``/``sequential`` blocks that require multithreading (due to the parallel execution of long loops, complex algorithms, or algorithms that depend on external input) will cause the compiler to return an error.

doc/slides/artiq_overview.tex

@@ -117,10 +117,10 @@ dds.pulse(200*MHz, 11*us)     # exactly 1 ms after trigger
   \footnotesize
   \begin{minted}[frame=leftline]{python}
 with sequential:
-    with parallel:
+    with interleave:
         a.pulse(100*MHz, 10*us)
         b.pulse(200*MHz, 20*us)
-    with parallel:
+    with interleave:
         c.pulse(300*MHz, 30*us)
         d.pulse(400*MHz, 20*us)
   \end{minted}
@@ -128,7 +128,7 @@ with sequential:
   \begin{itemize}
     \item Experiments are inherently parallel:
         simultaneous laser pulses, parallel cooling of ions in different trap zones
-    \item \verb!parallel! and \verb!sequential! contexts with arbitrary nesting
+    \item \verb!interleave! and \verb!sequential! contexts with arbitrary nesting
     \item \verb!a! and \verb!b! pulses both start at the same time
     \item \verb!c! and \verb!d! pulses both start when \verb!a! and \verb!b! are both done
       (after 20\,µs)
@@ -181,7 +181,7 @@ class Experiment:
 
     @kernel
     def run(self):
-        with parallel:
+        with interleave:
           self.ion1.cool(duration=10*us)
           self.ion2.cool(frequency=...)
         self.transporter.move(speed=...)
@@ -222,7 +222,7 @@ class Experiment:
     \item RPC and exception mappings are generated
     \item Constants and small kernels are inlined
     \item Small loops are unrolled
-    \item Statements in parallel blocks are interleaved
+    \item Statements in interleave blocks are interleaved
     \item Time is converted to RTIO clock cycles
     \item The Python AST is converted to LLVM IR
     \item The LLVM IR is compiled to OpenRISC machine code
@@ -244,7 +244,7 @@ class Experiment:
   \item Scheduling of experiments \\
       e.g.\ calibrations, queue
   \item Archival of results (HDF5 format)
-  \item Graphical user interface \\ 
+  \item Graphical user interface \\
   	run with arguments, schedule, real-time plotting
   \end{itemize}
 \end{frame}
@@ -262,7 +262,7 @@ class Experiment:
   \item Novatech 409B DDS
   \item Thorlabs motor controllers
   \end{itemize}
-\end{frame}  
+\end{frame}
 
 \begin{frame}
   \begin{center}

doc/slides/taaccs.tex

@@ -10,7 +10,7 @@
 \usepackage{multimedia}
 \usepackage{tikz}
 \usetikzlibrary{arrows,shapes,snakes,positioning,backgrounds,decorations,graphs}
-\definecolor{ethblue}{rgb}{0, 0.2, 0.3568} 
+\definecolor{ethblue}{rgb}{0, 0.2, 0.3568}
 \usepackage{minted}
 
 \mode<presentation>
@@ -133,10 +133,10 @@ dds.pulse(200*MHz, 11*us)     # exactly 1 ms after trigger
   \footnotesize
   \begin{minted}[frame=leftline]{python}
 with sequential:
-    with parallel:
+    with interleave:
         a.pulse(100*MHz, 10*us)
         b.pulse(200*MHz, 20*us)
-    with parallel:
+    with interleave:
         c.pulse(300*MHz, 30*us)
         d.pulse(400*MHz, 20*us)
   \end{minted}
@@ -144,7 +144,7 @@ with sequential:
   \begin{itemize}
     \item Experiments are inherently parallel:
         simultaneous laser pulses, parallel cooling of ions in different trap zones
-    \item \verb!parallel! and \verb!sequential! contexts with arbitrary nesting
+    \item \verb!interleave! and \verb!sequential! contexts with arbitrary nesting
     \item \verb!a! and \verb!b! pulses both start at the same time
     \item \verb!c! and \verb!d! pulses both start when \verb!a! and \verb!b! are both done
       (after 20\,µs)
@@ -197,7 +197,7 @@ class Experiment:
 
     @kernel
     def run(self):
-        with parallel:
+        with interleave:
           self.ion1.cool(duration=10*us)
           self.ion2.cool(frequency=...)
         self.transporter.move(speed=...)
@@ -238,7 +238,7 @@ class Experiment:
     \item RPC and exception mappings are generated
     \item Constants and small kernels are inlined
     \item Small loops are unrolled
-    \item Statements in parallel blocks are interleaved
+    \item Statements in interleave blocks are interleaved
     \item Time is converted to RTIO clock cycles
     \item The Python AST is converted to LLVM IR
     \item The LLVM IR is compiled to OpenRISC machine code

examples/master/repository/coredevice_examples/photon_histogram.py

@@ -28,7 +28,7 @@ class PhotonHistogram(EnvExperiment):
 
     @kernel
     def cool_detect(self):
-        with parallel:
+        with interleave:
             self.bd_sw.pulse(1*ms)
             self.bdd_sw.pulse(1*ms)
 
@@ -36,7 +36,7 @@ class PhotonHistogram(EnvExperiment):
         self.bd_sw.pulse(100*us)
 
         self.bd_dds.set(self.detect_f)
-        with parallel:
+        with interleave:
             self.bd_sw.pulse(self.detect_t)
             self.pmt.gate_rising(self.detect_t)
 

examples/master/repository/coredevice_examples/simple/dds_test.py

@@ -27,7 +27,7 @@ class DDSTest(EnvExperiment):
                 self.led.on()
             else:
                 self.led.off()
-            with parallel:
+            with interleave:
                 with sequential:
                     self.dds0.set(100*MHz + 4*i*kHz)
                     self.ttl0.pulse(500*us)

examples/master/repository/coredevice_examples/tdr.py

@@ -62,7 +62,7 @@ class TDR(EnvExperiment):
     @kernel
     def one(self, t, p):
         t0 = now_mu()
-        with parallel:
+        with interleave:
             self.pmt0.gate_both_mu(2*p)
             self.ttl2.pulse_mu(p)
         for i in range(len(t)):

examples/sim/al_spectroscopy.py

@@ -24,7 +24,7 @@ class AluminumSpectroscopy(EnvExperiment):
             delay(10*us)
             self.laser_cooling.pulse(100*MHz, 100*us)
             delay(5*us)
-            with parallel:
+            with interleave:
                 self.spectroscopy.pulse(self.spectroscopy_freq, 100*us)
                 with sequential:
                     delay(50*us)
@@ -32,7 +32,7 @@ class AluminumSpectroscopy(EnvExperiment):
             delay(5*us)
             while True:
                 delay(5*us)
-                with parallel:
+                with interleave:
                     self.state_detection.pulse(100*MHz, 10*us)
                     photon_count = self.pmt.count_gate(10*us)
                 if (photon_count < self.photon_limit_low

examples/sim/simple_simulation.py

@@ -11,7 +11,7 @@ class SimpleSimulation(EnvExperiment):
 
     @kernel
     def run(self):
-        with parallel:
+        with interleave:
             with sequential:
                 self.a.pulse(100*MHz, 20*us)
                 self.b.pulse(200*MHz, 20*us)