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Improve profiling output when duration filter is specified

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In particular:

  - Use strict inequality for comparisons, since that's what the filter
    syntax supports.

  - Convert to millis for comparisons, since that's the unit used both
    for the filter and when printing.

Now something like `RA_PROFILE='*>0'` will only print things that took
at least 1ms (when rounded to millis).

Signed-off-by: Michal Terepeta <michal.terepeta@gmail.com>
This commit is contained in:
Michal Terepeta 2020-01-02 17:21:40 +01:00
parent 4516c4c144
commit bc91120b7c
1 changed files with 25 additions and 4 deletions
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29
crates/ra_prof/src/lib.rs
View file

@ -197,7 +197,10 @@ impl Drop for Profiler {
if level == 0 {
let stdout = stderr();
let longer_than = stack.filter_data.longer_than;
if duration >= longer_than {
// Convert to millis for comparison to avoid problems with rounding
// (otherwise we could print `0ms` despite user's `>0` filter when
// `duration` is just a few nanos).
if duration.as_millis() > longer_than.as_millis() {
print(0, &stack.messages, &mut stdout.lock(), longer_than, None);
}
stack.messages.clear();
@ -226,7 +229,7 @@ fn print(
continue;
}
accounted_for += duration;
if duration >= longer_than {
if duration.as_millis() > longer_than.as_millis() {
writeln!(out, "{}{:5}ms - {}", indent, duration.as_millis(), msg)
.expect("printing profiling info to stdout");
@ -251,8 +254,9 @@ fn print(
if let Some(total) = total {
if let Some(unaccounted) = total.checked_sub(accounted_for) {
if unaccounted >= longer_than && last > 0 {
writeln!(out, "{}{:5}ms - ???", indent, unaccounted.as_millis())
let unaccounted_millis = unaccounted.as_millis();
if unaccounted_millis > longer_than.as_millis() && unaccounted_millis > 0 && last > 0 {
writeln!(out, "{}{:5}ms - ???", indent, unaccounted_millis)
.expect("printing profiling info to stdout");
}
}
@ -356,4 +360,21 @@ mod tests {
fn profiling_function2() {
let _p = profile("profile2");
}
#[test]
fn test_longer_than() {
let mut result = vec![];
let msgs = vec![
Message { level: 1, duration: Duration::from_nanos(3), message: "bar".to_owned() },
Message { level: 1, duration: Duration::from_nanos(2), message: "bar".to_owned() },
Message { level: 0, duration: Duration::from_millis(1), message: "foo".to_owned() },
];
print(0, &msgs, &mut result, Duration::from_millis(0), Some(Duration::from_millis(1)));
// The calls to `bar` are so short that they'll be rounded to 0ms and should get collapsed
// when printing.
assert_eq!(
std::str::from_utf8(&result).unwrap(),
" 1ms - foo\n 0ms - bar (2 calls)\n"
);
}
}