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Re: Increase in CPU usage in 8.7.1 vs 8.6.0 for rate-limited downloads
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From: David Pfitzner via curl-library <curl-library_at_lists.haxx.se>
Date: Wed, 15 May 2024 20:33:47 +0930
On Wed, May 15, 2024 at 5:31 PM Daniel Stenberg <daniel_at_haxx.se> wrote:
> On Wed, 15 May 2024, David Pfitzner via curl-library wrote:
>
> > From testing, this change appears to be due to this commit:
> >
> >
> https://github.com/curl/curl/commit/db5c9f4f9e0779b49624752b135281a0717b277b
>
> So just reverting this single commit makes it "good" again?
>
Correct.
>
> > Perhaps it would be useful for a user of libcurl to be able to (somehow)
> > control this tradeoff between rate-limiting accuracy and CPU usage?
>
> Perhaps getting more data would be a first step. How big difference in
> rate-limit accuracy does this commit make in your case?
>
> I have not looked at that carefully, but casually I don't see much
difference if any. But possibly closer inspection may find a systematic
difference. I also suspect one may see bigger differences in some regime
different to what I'm looking at - eg, smaller files.
-- David
Date: Wed, 15 May 2024 20:33:47 +0930
On Wed, May 15, 2024 at 5:31 PM Daniel Stenberg <daniel_at_haxx.se> wrote:
> On Wed, 15 May 2024, David Pfitzner via curl-library wrote:
>
> > From testing, this change appears to be due to this commit:
> >
> >
> https://github.com/curl/curl/commit/db5c9f4f9e0779b49624752b135281a0717b277b
>
> So just reverting this single commit makes it "good" again?
>
Correct.
>
> > Perhaps it would be useful for a user of libcurl to be able to (somehow)
> > control this tradeoff between rate-limiting accuracy and CPU usage?
>
> Perhaps getting more data would be a first step. How big difference in
> rate-limit accuracy does this commit make in your case?
>
> I have not looked at that carefully, but casually I don't see much
difference if any. But possibly closer inspection may find a systematic
difference. I also suspect one may see bigger differences in some regime
different to what I'm looking at - eg, smaller files.
-- David
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