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Message-ID: <471C75E7.2070400@draigBrady.com> Date: Mon, 22 Oct 2007 11:05:27 +0100 From: Pádraig Brady <P@...igBrady.com> To: "Ravinandan Arakali (rarakali)" <rarakali@...co.com> CC: Linux Kernel <linux-kernel@...r.kernel.org> Subject: Re: Question about free/used memory on Linux Ravinandan Arakali (rarakali) wrote: > Hi kernel gurus, > I am trying to find out the memory that's used on my linux box. > I find that there are quite a few confusing metrics. How do > I find out the "true" used memory ? > > 1. For eg. "free -m" shows free memory (excluding buffers/caches) > as 308 MB while I can see(from "df" output) that the the tmpfs > partitions take up about 400 MB. So, does "free -m" not consider > the tmpfs partitions ? > > 2. I try to add up RSS field of all processes reported by > "ps aux" command. But is it true that this would be misleading > in that, shared memory used by, say 2 processes would show > up twice here although there's only one copy in memory. Also > does this consider the fact that there's only one copy > of shared libraries ? Have a look at this script so show RAM used by programs: http://www.pixelbeat.org/scripts/ps_mem.py Note to display totals you will need this patch applied: http://lkml.org/lkml/2007/8/13/1224 Pádraig. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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