Portmaster - profile guided optimization and ccache

[wismos]

hey there i have been using portmaster for some time and i find it more suitable for my usecase compared to poudriere so i would like to tell that i intend to stick to portmaster as long as possible before someone asks me to switch to poudriere but i have been wondering for some time if it is possible to use optimization flags like pgo and ccache with it, i tried looking in the man page but i failed to find anything regarding maybe i didn't looked hard enough, anyways, any help will be appreciated

 

[freethread]

I used for a small period many years ago and I'm not sure about the exact use. Install devel/ccache then set make variables in /etc/make.conf. You find variables to set in the file /usr/ports/Mk/bsd.ccache.mk

 

[wismos]

I used for a small period many years ago and I'm not sure about the exact use. Install devel/ccache then set make variables in /etc/make.conf. You find variables to set in the file /usr/ports/Mk/bsd.ccache.mk

thanks, do you know something about pgo as well?

 

[freethread]

Profile Guided Optimization? No, I'm sorry. Some ports have options for Link Time Optimization (LTO), but for most of them (if not all) are off by default.

 

[Argentum]

hey there i have been using portmaster for some time and i find it more suitable for my usecase compared to poudriere so i would like to tell that i intend to stick to portmaster as long as possible before someone asks me to switch to

I used ports-mgmt/portupgrade for a longer period; briefly tried portmaster in between, but soon went back to using portupgrade. Have also experience with ports-mgmt/synth.

 

[wismos]

Profile Guided Optimization? No, I'm sorry. Some ports have options for Link Time Optimization (LTO), but for most of them (if not all) are off by default.

i see, i thought it was possible to enable them system wide for all packages, my bad, thanks for the help anyways

 

[freethread]

i see, i thought it was possible to enable them system wide for all packages, my bad, thanks for the help anyways

Yes it should be. Enabling ports-wide options in /etc/make.conf. See this thread Global ports configuration in make.conf in 2023

 

[cracauer@]

Where are you gonna get the profiles for profile guided optimiztion?

 

[wismos]

Where are you gonna get the profiles for profile guided optimiztion?

is it not possible to do with clang options like -fprofile-instr-generate ?

 

[cracauer@]

is it not possible to do with clang options like -fprofile-instr-generate ?

Yeah, but only if you exercise the code afterwards.

 

[wismos]

Yeah, but only if you exercise the code afterwards.

i think i can use sep and feed that to llvm-profgen --perfscript and the output of llvm-profgen back to clang with the -fprofile-sample-use=code.prof flag

 

[cracauer@]

i think i can use sep and feed that to llvm-profgen --perfscript and the output of llvm-profgen back to clang with the -fprofile-sample-use=code.prof flag

Then I'm curious about the outcome. I haven't played with it myself.

 

[wismos]

Then I'm curious out the outcome. I haven't played with it myself.

i haven't tried it myself yet btw, might try some day when i have more modern hardware

 

[cracauer@]

i haven't tried it myself yet btw, might try some day when i have more modern hardware

If your computer is fast enough anyway that takes the fun out of optimizing

 

[wismos]

If your computer is fast enough anyway that takes the fun out of optimizing

haha, that's true but it's not fun to wait a week for something as big as firefox to finish compiling as well XD