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Allow custom sleep on tsc fallback.

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This gives the user more control over the spectrum of precision vs. load time on Windows. Spall's output with much lower sleep times is still useful in my experience.

NOTE: A better API might be to allow the user to pass the freq as a param to "create_context" in case they already paid for it beforehand, but this seems fine for now.
This commit is contained in:
Matias Fernandez
2023-05-09 00:03:58 -04:00
parent 1ed105205c
commit 57c14f6a9b
2 changed files with 4 additions and 4 deletions
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4
core/prof/spall/spall.odin
View File

@@ -67,14 +67,14 @@ Buffer :: struct {
BUFFER_DEFAULT_SIZE :: 0x10_0000
context_create :: proc(filename: string) -> (ctx: Context, ok: bool) #optional_ok {
context_create :: proc(filename: string, freq_fallback_sleep := 2 * time.Second) -> (ctx: Context, ok: bool) #optional_ok {
fd, err := os.open(filename, os.O_WRONLY | os.O_APPEND | os.O_CREATE | os.O_TRUNC, 0o600)
if err != os.ERROR_NONE {
return
}
ctx.fd = fd
freq, freq_ok := time.tsc_frequency()
freq, freq_ok := time.tsc_frequency(freq_fallback_sleep)
ctx.precise_time = freq_ok
ctx.timestamp_scale = ((1 / f64(freq)) * 1_000_000) if freq_ok else 1

4
core/time/perf.odin
View File

@@ -70,7 +70,7 @@ has_invariant_tsc :: proc "contextless" () -> bool {
return false
}
tsc_frequency :: proc "contextless" () -> (u64, bool) {
tsc_frequency :: proc "contextless" (fallback_sleep := 2 * Second) -> (u64, bool) {
if !has_invariant_tsc() {
return 0, false
}
@@ -81,7 +81,7 @@ tsc_frequency :: proc "contextless" () -> (u64, bool) {
tsc_begin := intrinsics.read_cycle_counter()
tick_begin := tick_now()
sleep(2 * Second)
sleep(fallback_sleep)
tsc_end := intrinsics.read_cycle_counter()
tick_end := tick_now()