On Tuesday, 5 December 2017 04:11:17 GMT taii...@gmx.com wrote: > On my 16 core opteron I have to do -j32 or sometimes -j64 to be using > everything all the time, is this normal? If I don't do this it won't be > pegged at 100% all the time.
On my 12-thread i7 I have -j24 -l60. Most times it's better not to limit the number of jobs, just the load average; then portage loads up the CPU as high as it can. The exception, and even this is debatable, is when you're compiling a large set of packages, say an emerge -e world, in which case so many jobs have been started by the time they're all into compiling that the load soars to silly heights - I've seen 80-odd here. But that's only about seven jobs queued per CPU thread, so maybe it isn't too bad after all. > I assume using a ramdisk would help with this? I wouldn't want to do a > SSD as I assume it would excessively wear by doing compiles. I use tmpfs, like this: $ grep tmpfs /etc/fstab tmpfs /var/tmp/portage tmpfs noatime,uid=portage,gid=portage,mode=0775 0 0 tmpfs /tmp tmpfs noatime,nosuid,nodev,noexec,mode=1777 0 0 If a tmpfs fills up, the excess gets swapped out, but with 32GB RAM here I haven't yet seen any swap used at all - not even in an emerge -e world. I've read that modern SSDs are far less prone to wear than earlier ones, as R0b0t1 suggests. -- Regards, Peter.
