fs: improve promises.readFile performance #37127
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If we have an estimate of the file size available from the previous stat call, use that for the size of the first chunk to be read. This increases performance by reading more data (and, most likely, all data) at once without incurring memory overhead in most situations.
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CI: https://ci.nodejs.org/job/node-test-pull-request/35809/ (:green_heart:) |
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PR-URL: #37127 Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Darshan Sen <raisinten@gmail.com> Reviewed-By: Zijian Liu <lxxyxzj@gmail.com> Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com> Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com>
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If we have an estimate of the file size available from the previous stat call, use that for the size of the first chunk to be read. This increases performance by reading more data (and, most likely, all data) at once without incurring memory overhead in most situations. PR-URL: #37127 Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Darshan Sen <raisinten@gmail.com> Reviewed-By: Zijian Liu <lxxyxzj@gmail.com> Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com> Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com>
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PR-URL: #37127 Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Darshan Sen <raisinten@gmail.com> Reviewed-By: Zijian Liu <lxxyxzj@gmail.com> Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com> Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com>
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If we have an estimate of the file size available from the previous stat call, use that for the size of the first chunk to be read. This increases performance by reading more data (and, most likely, all data) at once without incurring memory overhead in most situations. PR-URL: #37127 Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Darshan Sen <raisinten@gmail.com> Reviewed-By: Zijian Liu <lxxyxzj@gmail.com> Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com> Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com>
This was referenced Mar 10, 2021
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PR-URL: #37127 Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Darshan Sen <raisinten@gmail.com> Reviewed-By: Zijian Liu <lxxyxzj@gmail.com> Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com> Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com>
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fs: only use Buffer.concat in promises.readFile when necessary
fs: read full size if known in promises.readFile
If we have an estimate of the file size available from the previous
stat call, use that for the size of the first chunk to be read.
This increases performance by reading more data (and, most likely,
all data) at once without incurring memory overhead in most situations.