mirror of https://github.com/m-labs/artiq.git
runtime: don't print debug messages to the UART.
It takes ~4ms to print an empty log line because of how slow the UART is. This makes the log timestamps useless for debugging performance problems. After this commit, it takes ~75us to print an empty log line instead, which pessimizes test_rpc_timing by less than 2ms with tracing enabled.
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@ -97,7 +97,7 @@ pub extern "C" fn _Unwind_Resume() -> ! {
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#[no_mangle]
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pub unsafe extern fn rust_main() {
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static mut LOG_BUFFER: [u8; 4096] = [0; 4096];
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static mut LOG_BUFFER: [u8; 65536] = [0; 65536];
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BufferLogger::new(&mut LOG_BUFFER[..])
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.register(move || {
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info!("booting ARTIQ...");
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@ -1,6 +1,6 @@
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use core::{mem, ptr};
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use core::cell::RefCell;
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use log::{self, Log, LogMetadata, LogRecord, LogLevelFilter};
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use log::{self, Log, LogLevel, LogMetadata, LogRecord, LogLevelFilter};
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use log_buffer::LogBuffer;
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use clock;
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@ -61,8 +61,10 @@ impl Log for BufferLogger {
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writeln!(self.buffer.borrow_mut(),
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"[{:12}us] {:>5}({}): {}",
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clock::get_us(), record.level(), record.target(), record.args()).unwrap();
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println!("[{:12}us] {:>5}({}): {}",
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clock::get_us(), record.level(), record.target(), record.args());
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if record.level() <= LogLevel::Info {
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println!("[{:12}us] {:>5}({}): {}",
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clock::get_us(), record.level(), record.target(), record.args());
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}
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}
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}
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}
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