Khem was asking if anyone had seen a >30% difference in build time for qemuarm compared to other machines. I don't when building on my system:
rmacleod@yow-rmacleod-lx3 b/c-i-m-x86 $ cat x86 real 43m29.142s user 0m19.887s sys 0m4.110s
rmacleod@yow-rmacleod-lx3 b/c-i-m-x86 $ cat arm real 42m58.185s user 0m19.546s sys 0m3.867s
This machine is relatively isolated in that there are no other users. The arm build was done second and I didn't pre-populate the downloads but so that may account for the 30 second difference. I wasn't using sstate for either build. -- # Randy MacLeod # Wind River Linux
Khem was asking if anyone had seen a >30% difference in build time for qemuarm compared to other machines. I don't when building on my system: rmacleod@yow-rmacleod-lx3 b/c-i-m-x86 $ cat x86 real 43m29.142s user 0m19.887s sys 0m4.110s rmacleod@yow-rmacleod-lx3 b/c-i-m-x86 $ cat arm real 42m58.185s user 0m19.546s sys 0m3.867s This machine is relatively isolated in that there are no other users. The arm build was done second and I didn't pre-populate the downloads but so that may account for the 30 second difference. I wasn't using sstate for either build.
Thanks for this infor Randy, really appreciated, I think I will also look at the h/w angle.
On Tue, 30 Mar 2021 at 20:41, Khem Raj <raj.khem@...> wrote:
Thanks for this infor Randy, really appreciated, I think I will also look at the h/w angle.
Khem: if you can reproduce this on demand with a clean build (ie oe-init-build-env with a clean build directory, just set DL_DIR) then enabling buildstats would give some interesting metrics. buildstats-diff can compare two build runs and tell you what the differences are.
On Tue, 30 Mar 2021 at 20:41, Khem Raj <raj.khem@...> wrote:
Thanks for this infor Randy, really appreciated, I think I will also look at the h/w angle.
Khem: if you can reproduce this on demand with a clean build (ie oe-init-build-env with a clean build directory, just set DL_DIR) then enabling buildstats would give some interesting metrics. buildstats-diff can compare two build runs and tell you what the differences are.
yeah this is doing world build of not only core but several other layers included a usual build takes around 10 hrs for this machine config, I am planning to
1. Collect build stats 2. buiid another qemu machine on this VM
it could very well be rotting hardware underneath the VM.
On Tue, Mar 30, 2021 at 2:20 PM Khem Raj <raj.khem@...> wrote:
On 3/30/21 1:48 PM, Ross Burton wrote:
On Tue, 30 Mar 2021 at 20:41, Khem Raj <raj.khem@...> wrote:
Thanks for this infor Randy, really appreciated, I think I will also look at the h/w angle.
Khem: if you can reproduce this on demand with a clean build (ie oe-init-build-env with a clean build directory, just set DL_DIR) then enabling buildstats would give some interesting metrics. buildstats-diff can compare two build runs and tell you what the differences are.
yeah this is doing world build of not only core but several other layers included a usual build takes around 10 hrs for this machine config, I am planning to
1. Collect build stats 2. buiid another qemu machine on this VM
it could very well be rotting hardware underneath the VM.
To close the loop, it turned out to be the case that CPU performance on VM has deteriorated which stress-ng showed. The VM has been rebuilt and everything seems to be holding fine now. Thanks for your help and chiming in.
