Re: Recommended amount of swap
05.09.2011 22:48, Dan Nelson написав(ла): In the last episode (Sep 05), Sean Hamilton said: What is the state of the art for the recommended amount of swap in FreeBSD? Both normal systems with 512 MB - 8 GB of RAM, and large database systems with around 128 - 256 GB. I suggest 2x RAM for systems less than 4gb or so. Anything more than 4GB of swap is probably never going to be used, and if it is used, you're just going to thrash your swap device. If you have 128GB of RAM and need to swap to disk, you desperately need more RAM, not swap :) My +1 to wishlist, I want OpenOffice to not trash memory when reading large xlsx files. Mem: 1937M Active, 243M Inact, 672M Wired, 98M Cache, 9412K Free Swap: 36G Total, 21G Used, 15G Free, 59% Inuse, 252K In PID USERNAMETHR PRI NICE SIZERES STATE C TIME WCPU COMMAND 1912 arcade5 451 23311M 1721M ucond 0 66:07 55.37% /usr/local/openoffice.org-3.3.0/openoffice.org3/program/so Different things happens. When I hardly need some swap I think about: 0. More RAM. 1. Spare flash or SSD. 2. Another disk. 3. Touching disk sizes. Also please note that system that uses at least 1G of swap actively (I don't mean tmp/mdfs or long running non active processes) is dripping slime and therefor is useless and should be upgraded. -- Sphinx of black quartz judge my vow. ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to freebsd-hackers-unsubscr...@freebsd.org
Recommended amount of swap
What is the state of the art for the recommended amount of swap in FreeBSD? Both normal systems with 512 MB - 8 GB of RAM, and large database systems with around 128 - 256 GB. Thanks in advance, -- Sean Hamilton seanhamil...@gmail.com ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to freebsd-hackers-unsubscr...@freebsd.org
Re: Recommended amount of swap
In the last episode (Sep 05), Sean Hamilton said: What is the state of the art for the recommended amount of swap in FreeBSD? Both normal systems with 512 MB - 8 GB of RAM, and large database systems with around 128 - 256 GB. I suggest 2x RAM for systems less than 4gb or so. Anything more than 4GB of swap is probably never going to be used, and if it is used, you're just going to thrash your swap device. If you have 128GB of RAM and need to swap to disk, you desperately need more RAM, not swap :) -- Dan Nelson dnel...@allantgroup.com ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to freebsd-hackers-unsubscr...@freebsd.org
Re: Recommended amount of swap
On Mon, Sep 5, 2011 at 3:48 PM, Dan Nelson dnel...@allantgroup.com wrote: In the last episode (Sep 05), Sean Hamilton said: What is the state of the art for the recommended amount of swap in FreeBSD? Both normal systems with 512 MB - 8 GB of RAM, and large database systems with around 128 - 256 GB. Keep in mind that you need at least ram = swap to get a coredump. -- Dan Nelson dnel...@allantgroup.com ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to freebsd-hackers-unsubscr...@freebsd.org -- Eitan Adler ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to freebsd-hackers-unsubscr...@freebsd.org
Re: Recommended amount of swap
On Mon, 5 Sep 2011 14:48:57 -0500 Dan Nelson wrote: In the last episode (Sep 05), Sean Hamilton said: What is the state of the art for the recommended amount of swap in FreeBSD? Both normal systems with 512 MB - 8 GB of RAM, and large database systems with around 128 - 256 GB. I suggest 2x RAM for systems less than 4gb or so. Anything more than 4GB of swap is probably never going to be used, and if it is used, you're just going to thrash your swap device. but tmpfs (and swap-backed md devices) can use substantial amounts of swap without contributing to thrashing. In some cases it may be possible to justify larger amounts of swap. ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to freebsd-hackers-unsubscr...@freebsd.org
Re: Recommended amount of swap
In the last episode (Sep 05), Eitan Adler said: On Mon, Sep 5, 2011 at 3:48 PM, Dan Nelson dnel...@allantgroup.com wrote: In the last episode (Sep 05), Sean Hamilton said: What is the state of the art for the recommended amount of swap in FreeBSD? Both normal systems with 512 MB - 8 GB of RAM, and large database systems with around 128 - 256 GB. Keep in mind that you need at least ram = swap to get a coredump. Not if debug.minidump is set to 1, which it is by default. In that case, only mapped memory gets dumped, which should ignore disk cache pages and be a lot smaller than your RAM size. Enabling ZFS may make your dumps bigger unless the minidump code is smart enough to not dump the ARC. -- Dan Nelson dnel...@allantgroup.com ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to freebsd-hackers-unsubscr...@freebsd.org
Re: Recommended amount of swap
On Mon, Sep 05, 2011 at 02:48:57PM -0500, Dan Nelson wrote: I suggest 2x RAM for systems less than 4gb or so. Anything more than 4GB of swap is probably never going to be used I see you don't do mass package builds :-) Or, even build openoffice or some of the math packages. and if it is used, you're just going to thrash your swap device. That's us! :-) mcl ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to freebsd-hackers-unsubscr...@freebsd.org
