Den mån 14 feb. 2022 kl 09:11 skrev Daniel Stenberg via curl-library < curl-library@lists.haxx.se>:
> On Thu, 10 Feb 2022, Daniel Stenberg via curl-library wrote: > > > In 7.81.0 this made 596 to 600 strlen() calls. > > > > In git master, this now makes 390 to 392 calls. A 33% reduction. > > After some more cleaning up by Henrik: > > 223 to 225 calls. A 62% reduction from 7.81.0! > To give these some real world numbers I used the timings provided by the trace spent by each strlen call and for the https://google.com case the savings vs 7.81.0 is aprox 80-100µs. While this is not an astronomical number compared with the whole run (aprox 940000µs on my home machine) they where #1 completely unnecessary, #2 very low hanging fruit, and #3 a bit more important for applications that juggle around a lot fo easy handles since actual cpu time is spent on the strlen calls vs the network transfer (which is the vast majority of the time spent) which happens in parallel to juggling around the easy handles. Still if we can eliminate the unnecessary call to poll in the multi interface that would alone make a similar saving (since they are syscalls they are much much more heavy) so there are still some further gains to be made. /HH > > -- > > / daniel.haxx.se > | Commercial curl support up to 24x7 is available! > | Private help, bug fixes, support, ports, new features > | https://curl.se/support.html > -- > Unsubscribe: https://lists.haxx.se/listinfo/curl-library > Etiquette: https://curl.haxx.se/mail/etiquette.html >
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