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Hello Microcal, |
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|
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I use tmpfs heavily as I have an SSD. |
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Here are some information that can help you : |
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|
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tank woody # mount -v | grep tmpfs |
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devtmpfs on /dev type devtmpfs |
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(rw,relatime,size=8050440k,nr_inodes=2012610,mode=755) |
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tmpfs on /run type tmpfs (rw,nosuid,nodev,relatime,size=1610408k,mode=755) |
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shm on /dev/shm type tmpfs (rw,nosuid,nodev,noexec,relatime) |
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cgroup_root on /sys/fs/cgroup type tmpfs |
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(rw,nosuid,nodev,noexec,relatime,size=10240k,mode=755) |
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tmpfs on /var/tmp/portage type tmpfs (rw,size=12G) |
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tmpfs on /usr/portage type tmpfs (rw,size=12G) |
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tmpfs on /usr/src type tmpfs (rw,size=12G) |
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tmpfs on /tmp type tmpfs (rw,size=12G) |
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tmpfs on /home/woody/.mutt/cache type tmpfs (rw) |
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|
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tank woody # cat /etc/fstab |
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# /etc/fstab: static file system information. |
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# |
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# noatime turns off atimes for increased performance (atimes normally |
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aren't |
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# needed); notail increases performance of ReiserFS (at the expense of |
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storage |
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# efficiency). It's safe to drop the noatime options if you want and to |
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# switch between notail / tail freely. |
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# |
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# The root filesystem should have a pass number of either 0 or 1. |
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# All other filesystems should have a pass number of 0 or greater than 1. |
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# |
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# See the manpage fstab(5) for more information. |
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# |
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|
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# <fs> <mountpoint> <type> <opts> <dump/pass> |
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|
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# NOTE: If your BOOT partition is ReiserFS, add the notail option to opts. |
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/dev/sda1 / ext4 noatime,discard,user_xattr 0 1 |
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/dev/sda3 /home ext4 noatime,discard,user_xattr 0 1 |
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#/dev/sda6 /home ext3 noatime 0 1 |
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#/dev/sda2 none swap sw 0 0 |
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tmpfs /var/tmp/portage tmpfs size=12G 0 0 |
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tmpfs /usr/portage tmpfs size=12G 0 0 |
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tmpfs /usr/src tmpfs size=12G 0 0 |
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tmpfs /tmp tmpfs size=12G 0 0 |
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tmpfs /home/woody/.mutt/cache/ tmpfs size=12G 0 0 |
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#/dev/cdrom /mnt/cdrom auto noauto,ro 0 0 |
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#/dev/fd0 /mnt/floppy auto noauto 0 0 |
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tank woody # |
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|
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For the /usr/portage directory, if you reboot, all you have to do is |
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emerge-webrsync or do like me : |
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tank woody # l /usr/ | grep portage |
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924221 4 drwxr-xr-x 170 root root 4096 1 mars 02:51 portage_tmpfs |
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6771 0 drwxr-xr-x 171 root root 3500 11 juin 20:40 portage |
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tank woody # |
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|
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The /usr/portage_tmpfs is a backup of the /usr/portage, this avoid me |
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retreiving all portage information from gentoo's servers. |
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|
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Please note that I also use www-misc/profile-sync-daemon in order to |
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store my browsers cache on /tmp. |
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|
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I rarely shutdown my computer :) |
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Have fun |
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|
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On 19/06/2014 04:36, microcai wrote: |
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> rsync is doing bunch of 4k ramdon IO when updateing portage tree, |
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> that will kill SSDs with much higher Write Amplification Factror. |
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> |
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> |
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> I have a 2year old SSDs that have reported Write Amplification Factor |
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> of 26. I think the only reason is that I put portage tree on this SSD |
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> to speed it up. |
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> |
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> what is the suggest way to reduce Write Amplification of a portage sync ? |
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> |
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