Does pants have a way to surface a startup perform...
# randomj
jolly-midnight-72759
05/14/2020, 4:41 AMDoes pants have a way to surface a startup performance metric?
a
aloof-angle-91616
05/14/2020, 4:44 AMi believe running
./pants -x[setup][parse]aloof-angle-91616
05/14/2020, 4:44 AMalso
./pants serveraloof-angle-91616
05/14/2020, 4:44 AM[parse]h
hundreds-breakfast-49010
05/14/2020, 4:45 AMI've personally spent some time trying to improve the immediate command-line latency you notice when you just run any pants command
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h
hundreds-father-404
05/14/2020, 4:55 AMOne of our biggest priorities is to enable the pants daemon (Pantsd) by default. It greatly improves no-op performance. Cc @witty-crayon-22786 who is leading this initiative
w
witty-crayon-22786
05/14/2020, 4:56 AMYep.
witty-crayon-22786
05/14/2020, 4:58 AMI view the "cold builds are important so we won't do anything to make warm builds faster" argument of ninja to be a bit lazy. That's not a good reason not to have a daemon.
witty-crayon-22786
05/14/2020, 4:59 AMIt also completely precludes caching: you can't use file timestamps for anything beyond "on my machine is this up to date"... You need digests for anything more interesting
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a
aloof-angle-91616
05/14/2020, 5:00 AMthe author repeated multiple times they didn’t really have time for the project which is kinda sad
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aloof-angle-91616
05/14/2020, 5:01 AMi agree on the cold/warm bit. imho the fastest possible cold build and the fastest possible warm build feel very similar in spirit
w
witty-crayon-22786
05/14/2020, 5:02 AM@jolly-midnight-72759: but, yes: we have lots of good data sources for runtime data. A realistic target for the next few weeks is 400ms noops.
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a
aloof-angle-91616
05/14/2020, 5:02 AMand if you use a shared memory region you can even take advantage of keeping things resident in memory without needing a persistent process. just a thought i’ve been having recently
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