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83 lines
2.6 KiB
JavaScript
83 lines
2.6 KiB
JavaScript
const Metrics = require('./Metrics')
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const ONE_MB = 1024 * 1024
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function emitPdfStats(stats, timings) {
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if (timings['compute-pdf-caching']) {
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emitPdfCachingStats(stats, timings)
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} else {
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// How much bandwidth will the pdf incur when downloaded in full?
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Metrics.summary('pdf-bandwidth', stats['pdf-size'])
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}
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}
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function emitPdfCachingStats(stats, timings) {
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if (!stats['pdf-size']) return // double check
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// How large is the overhead of hashing up-front?
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const fraction =
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timings.compileE2E - timings['compute-pdf-caching'] !== 0
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? timings.compileE2E /
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(timings.compileE2E - timings['compute-pdf-caching'])
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: 1
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Metrics.summary('overhead-compute-pdf-ranges', fraction * 100 - 100)
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// How does the hashing scale to pdf size in MB?
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Metrics.timing(
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'compute-pdf-caching-relative-to-pdf-size',
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timings['compute-pdf-caching'] / (stats['pdf-size'] / ONE_MB)
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)
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if (stats['pdf-caching-total-ranges-size']) {
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// How does the hashing scale to total ranges size in MB?
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Metrics.timing(
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'compute-pdf-caching-relative-to-total-ranges-size',
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timings['compute-pdf-caching'] /
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(stats['pdf-caching-total-ranges-size'] / ONE_MB)
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)
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// How fast is the hashing per range on average?
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Metrics.timing(
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'compute-pdf-caching-relative-to-ranges-count',
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timings['compute-pdf-caching'] / stats['pdf-caching-n-ranges']
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)
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// How many ranges are new?
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Metrics.summary(
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'new-pdf-ranges-relative-to-total-ranges',
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(stats['pdf-caching-n-new-ranges'] / stats['pdf-caching-n-ranges']) * 100
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)
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}
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// How much content is cacheable?
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Metrics.summary(
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'cacheable-ranges-to-pdf-size',
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(stats['pdf-caching-total-ranges-size'] / stats['pdf-size']) * 100
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)
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const sizeWhenDownloadedInFull =
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// All of the pdf
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stats['pdf-size'] -
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// These ranges are potentially cached.
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stats['pdf-caching-total-ranges-size'] +
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// These ranges are not cached.
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stats['pdf-caching-new-ranges-size']
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// How much bandwidth can we save when downloading the pdf in full?
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Metrics.summary(
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'pdf-bandwidth-savings',
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100 - (sizeWhenDownloadedInFull / stats['pdf-size']) * 100
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)
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// How much bandwidth will the pdf incur when downloaded in full?
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Metrics.summary('pdf-bandwidth', sizeWhenDownloadedInFull)
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// How much space do the ranges use?
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// This will accumulate the ranges size over time, skipping already written ranges.
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Metrics.summary(
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'pdf-ranges-disk-size',
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stats['pdf-caching-new-ranges-size'] - stats['pdf-caching-reclaimed-space']
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)
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}
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module.exports = {
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emitPdfStats
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}
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