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| author | gavinp@chromium.org <gavinp@chromium.org@0039d316-1c4b-4281-b951-d872f2087c98> | 2012-08-24 16:39:39 +0000 |
|---|---|---|
| committer | gavinp@chromium.org <gavinp@chromium.org@0039d316-1c4b-4281-b951-d872f2087c98> | 2012-08-24 16:39:39 +0000 |
| commit | 658f9ca69a0c2187948618b55a9453068052838d (patch) | |
| tree | 42320ff686903c26d581e3156b8ee0753a53f8fb /net/disk_cache | |
| parent | e387f29e37fb64726428a20593df7fb5ebda4bdf (diff) | |
| download | chromium_src-658f9ca69a0c2187948618b55a9453068052838d.zip chromium_src-658f9ca69a0c2187948618b55a9453068052838d.tar.gz chromium_src-658f9ca69a0c2187948618b55a9453068052838d.tar.bz2 | |
New histograms to track disk cache hit rate by age and use time.
Previously we reported the age of the disk cache, and we reported the
hit rate of the disk cache, but there was no statistic that let us
correlate the two. These histograms let us see how the hit rate in a
cache varies with its age; perhaps we'll learn that there's an
equilibrium hit rate, or perhaps we'll learn how long it takes to
reach that.
R=rvargas@chromium.org,tburkard@chromium.org
BUG=None
Review URL: https://chromiumcodereview.appspot.com/10834361
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@153226 0039d316-1c4b-4281-b951-d872f2087c98
Diffstat (limited to 'net/disk_cache')
| -rw-r--r-- | net/disk_cache/backend_impl.cc | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/net/disk_cache/backend_impl.cc b/net/disk_cache/backend_impl.cc index 1fd92a1..71d4168 100644 --- a/net/disk_cache/backend_impl.cc +++ b/net/disk_cache/backend_impl.cc @@ -2026,7 +2026,16 @@ void BackendImpl::ReportStats() { return; CACHE_UMA(HOURS, "UseTime", 0, static_cast<int>(use_hours)); - CACHE_UMA(PERCENTAGE, "HitRatio", 0, stats_.GetHitRatio()); + const int hit_percentage = stats_.GetHitRatio(); + CACHE_UMA(PERCENTAGE, "HitRatio", 0, hit_percentage); + + // For any bin in HitRatioByTotalTime, the HitRatio of caches of that age is + // approximately the value of HitRatioByTotalTime / TotalTime. Likewise for + // HitRatioByUseTime. + if (base::RandInt(0, 99) < hit_percentage) + CACHE_UMA(HOURS, "HitRatioByTotalTime", 0, implicit_cast<int>(total_hours)); + if (base::RandInt(0, 99) < hit_percentage) + CACHE_UMA(HOURS, "HitRatioByUseTime", 0, implicit_cast<int>(use_hours)); int64 trim_rate = stats_.GetCounter(Stats::TRIM_ENTRY) / use_hours; CACHE_UMA(COUNTS, "TrimRate", 0, static_cast<int>(trim_rate)); |