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Merge pull request #253 from overleaf/jpa-debug-slow-pdf-caching

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[misc] ContentCacheMetrics: log slow pdf caching performance
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Jakob Ackermann 2021-06-23 12:39:13 +02:00 committed by GitHub
commit c3dba7f74d
1 changed files with 29 additions and 0 deletions
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29
services/clsi/app/js/ContentCacheMetrics.js
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@ -1,4 +1,20 @@
const logger = require('logger-sharelatex')
const Metrics = require('./Metrics')
const os = require('os')
let CACHED_LOAD = {
expires: -1,
load: [0, 0, 0]
}
function getSystemLoad() {
if (CACHED_LOAD.expires < Date.now()) {
CACHED_LOAD = {
expires: Date.now() + 10 * 1000,
load: os.loadavg()
}
}
return CACHED_LOAD.load
}
const ONE_MB = 1024 * 1024
@ -14,12 +30,25 @@ function emitPdfStats(stats, timings) {
function emitPdfCachingStats(stats, timings) {
if (!stats['pdf-size']) return // double check
// How much extra time did we spent in PDF.js?
Metrics.timing('compute-pdf-caching', timings['compute-pdf-caching'])
// How large is the overhead of hashing up-front?
const fraction =
timings.compileE2E - timings['compute-pdf-caching'] !== 0
? timings.compileE2E /
(timings.compileE2E - timings['compute-pdf-caching'])
: 1
if (fraction > 1.5 && timings.compileE2E > 10 * 1000) {
logger.warn(
{
stats,
timings,
load: getSystemLoad()
},
'slow pdf caching'
)
}
Metrics.summary('overhead-compute-pdf-ranges', fraction * 100 - 100)
// How does the hashing scale to pdf size in MB?