Am 02.06.2012 19:24, schrieb Gregory Maxwell: > Tmpfs just has the advantage of minimizing the disk activity— both in > cases where none is needed, and in cases where it is. you refuse to understand if some app creates a 2 GB file in /tmp and does not remove your only pressure is to the page-cache which is not the same as start swapping because memory pressure > Really, you should try it. It works very well and does not > make your machine perform poorly, even when under memory > pressure it have used tmpfs probably long before you even knew it exists (on some workloads even for /tmp) but it is not the holy grail for each workload and so a wrong DEFAULT Am 02.06.2012 19:25, schrieb Chris Adams: > Once upon a time, Reindl Harald <h.reindl@xxxxxxxxxxxxx> said: >> Am 02.06.2012 04:08, schrieb Jesse Keating: >>> The useless 2G file will get swapped out, not important things that are actively being used in ram >> >> it does not matter WHAT get swapped out >> from the moment on the system starts to swap performance sucks > > With /tmp-on-storage, that 2G file would have already caused a large > amount of I/O; it is the same 2G being written on to the same storage, > whether a /tmp filesystem or swap you refuse to understand the difference WHEN this happens writing 2 GB to disk on modern fileystems is meaningless having the 2 GB in memory and a by the introduced memory pressure swapped out application get the focus and allocate a large amount of memory while loading large data you have MULTIPLE pressure * relaod the application form swap * load application data from disk * write /tmp and/or other data to disk so you have THREE heavy disk usage patterns with mixed read and write - have fun with your coffee again: there may be workloads where it is nice and a small improvement as i have some of them by my self but that does NOT qulify it as a os-wide default
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