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On Mittwoch 06 Mai 2009, Mark Haney wrote: |
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> Volker Armin Hemmann wrote: |
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> > On Mittwoch 06 Mai 2009, Mark Haney wrote: |
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> >> Duncan wrote: |
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> >>> Consider pointing PORTAGE_TMPDIR at a tmpfs. |
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> >>> |
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> >>> The idea is based on the fact that everything portage does in its |
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> >>> tmpdir (/var/tmp by default) is temporary, erased as soon as it's done |
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> >>> emerging that package. Since tmpfs uses swap backed memory, |
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> >>> worst-case, it has to write to swap -- that is, to disk, which is where |
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> >>> it would otherwise be writing ALL the temporary files. With memory |
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> >>> access so much faster than disk access, every file that's erased before |
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> >>> it hits disk saves time, and it can make a BIG difference in emerge |
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> >>> times. |
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> >> |
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> >> Duncan, you talk about tmpfs and I'm suddenly interested in trying this |
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> >> out. My question is, how much space do you allocate for the tmpfs? I |
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> >> know it'll fall back to swap if I'm out of space there, but what works |
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> >> well for you? I have (currently) 1GB RAM on this system, but I'm |
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> >> getting ready to order more to get me to 4GB. |
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> > |
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> > 2gb. That is enough for almost everything. Not enough for openoffice. |
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> > tmpfs 2,0G 3,2M 2,0G 1% /var/tmp/portage |
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> > tmpfs 1,0G 116K 1,0G 1% /tmp |
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> |
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> Now how is that going to play out when I only have 1GB of RAM? |
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with 1gb of ram you don't do it. If you have 4gb - then yes. With 1gb. No. |
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Because even if tempfs can be shoved into swap it would be still slower. |
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