swap partition seems faster than a swap file (Re: [SHR-Unstable] swapon: swapfile has holes)
Matthias Huber matthias.hu...@wollishausen.de writes:
afaik, it is much faster than file.
On a computer with 256M ram and compact flash as storage I ran
#include stdio.h
#include stdlib.h
#include string.h
#include assert.h
#define BUFSIZE (400*1024*1024)
int main(int argc, char *argv[]) {
char *p;
int i;
int ret;
puts(allocating memory);
p = malloc(BUFSIZE);
assert(p);
puts(writing to memory);
for (i = 0; i BUFSIZE; i++) {
p[i] ^= 3;
}
puts(reading from memory);
for (i = 0; i BUFSIZE; i++) {
ret ^= p[i];
}
return ret;
}
with both cases. It seems that partition is somewhat faster indeed:
256M swap partition:
$ for i in 1 2 3 4; do time ./a.out ; done
allocating memory
writing to memory
reading from memory
real3m47.793s
user0m27.282s
sys 0m5.592s
allocating memory
writing to memory
reading from memory
real3m16.614s
user0m27.114s
sys 0m5.624s
allocating memory
writing to memory
reading from memory
real3m10.966s
user0m27.010s
sys 0m5.456s
allocating memory
writing to memory
reading from memory
real3m14.328s
user0m27.106s
sys 0m5.160s
256M swap file:
allocating memory
writing to memory
reading from memory
real6m19.494s
user0m27.630s
sys 0m6.956s
allocating memory
writing to memory
reading from memory
real3m49.047s
user0m27.698s
sys 0m5.028s
allocating memory
writing to memory
reading from memory
real4m18.462s
user0m27.442s
sys 0m5.296s
allocating memory
writing to memory
reading from memory
real4m1.905s
user0m27.858s
sys 0m4.928s
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Re: [SHR-Unstable] swapon: swapfile has holes
On Sat, 05 Sep 2009 10:57:32 +0200 Matthias Huber matthias.hu...@wollishausen.de wrote: Greg Bonett schrieb: Hi there, I just installed SHR unstable and I'm impressed at how usable and responsive it is. However, while I was performing a opkg operation I ran out of memory so I tried to add a swap file. When following the instructions at: http://wiki.openmoko.org/wiki/SHR_User_Manual#SwapSpace I get the error: swapon: /swapfile: Invalid argument and dmesg shows: swapon: swapfile has holes I've tried files on the sd card and also on the internal memory. Any suggestions? i could imagine, it must be at one extent, so you should try two things: * format your sdcard and make the swapfile on the newly created fs. *** but if you are formatting the card, you can make a real swap _partition_ also. I ended up making a swap partition and it seems to be working without any problems. Thanks for the help. -Greg ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: [SHR-Unstable] swapon: swapfile has holes
Greg Bonett schrieb: Hi there, I just installed SHR unstable and I'm impressed at how usable and responsive it is. However, while I was performing a opkg operation I ran out of memory so I tried to add a swap file. When following the instructions at: http://wiki.openmoko.org/wiki/SHR_User_Manual#SwapSpace I get the error: swapon: /swapfile: Invalid argument and dmesg shows: swapon: swapfile has holes I've tried files on the sd card and also on the internal memory. Any suggestions? i could imagine, it must be at one extent, so you should try two things: * format your sdcard and make the swapfile on the newly created fs. *** but if you are formatting the card, you can make a real swap _partition_ also. ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: [SHR-Unstable] swapon: swapfile has holes
On Sat, Sep 5, 2009 at 10:57 AM, Matthias Hubermatthias.hu...@wollishausen.de wrote: *** but if you are formatting the card, you can make a real swap _partition_ also. I prefer the file over partition, because you can make bigger or shrink whenever you want. And giving a separate partition is just a luxury, when you can only create four (above that serious tweaking is necessary). Best regards, Laszlo ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: [SHR-Unstable] swapon: swapfile has holes
Timo Juhani Lindfors schrieb: Matthias Huber matthias.hu...@wollishausen.de writes: *** but if you are formatting the card, you can make a real swap _partition_ also. What are the advantages of a swap partition? The only one I can think of is that it can be used for software suspend. afaik, it is much faster than file. -- MatzeHuber ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: [SHR-Unstable] swapon: swapfile has holes
On Sat, Sep 5, 2009 at 11:45 AM, Matthias Hubermatthias.hu...@wollishausen.de wrote: afaik, it is much faster than file. Benchmark it!;) I think glamo is enough bottleneck to make all the two the same slowiness... But just guessing. Laszlo ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: [SHR-Unstable] swapon: swapfile has holes
O Sábado, 5 de Setembro de 2009, Timo Juhani Lindfors escribiu: Matthias Huber matthias.hu...@wollishausen.de writes: *** but if you are formatting the card, you can make a real swap _partition_ also. What are the advantages of a swap partition? The only one I can think of is that it can be used for software suspend. If you have more than a distro installed, you can use *the same* partition for all distros. You will only waste space onece ;) -- David Garabana Barro jabber google talk ID:da...@garabana.com Clave pública PGP/GPG: http://davide.garabana.com/pgp.html signature.asc Description: This is a digitally signed message part. ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: [SHR-Unstable] swapon: swapfile has holes
O Sábado, 5 de Setembro de 2009, Laszlo KREKACS escribiu: I prefer the file over partition, because you can make bigger or shrink whenever you want. And giving a separate partition is just a luxury, when you can only create four (above that serious tweaking is necessary). Four??? You can create up to 7: r...@om-gta02 ~ $ fdisk -l /dev/mmcblk0 Disk /dev/mmcblk0: 7969 MB, 7969177600 bytes 246 heads, 62 sectors/track, 1020 cylinders Units = cylinders of 15252 * 512 = 7809024 bytes Device Boot Start End Blocks Id System /dev/mmcblk0p1 1 6 45725 83 Linux /dev/mmcblk0p2 7 108 777852 83 Linux /dev/mmcblk0p3 109 313 1563330 83 Linux /dev/mmcblk0p4 3141020 53915825 Extended /dev/mmcblk0p5 314 390 587171 83 Linux /dev/mmcblk0p6 391 994 4606073 83 Linux /dev/mmcblk0p7 9951020 198245 82 Linux swap / Solaris -- David Garabana Barro jabber google talk ID:da...@garabana.com Clave pública PGP/GPG: http://davide.garabana.com/pgp.html signature.asc Description: This is a digitally signed message part. ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: [SHR-Unstable] swapon: swapfile has holes
On Sat, 2009-09-05 at 11:45 +0200, Matthias Huber wrote: Timo Juhani Lindfors schrieb: Matthias Huber matthias.hu...@wollishausen.de writes: *** but if you are formatting the card, you can make a real swap _partition_ also. What are the advantages of a swap partition? The only one I can think of is that it can be used for software suspend. afaik, it is much faster than file. -- MatzeHuber I use swapfiles occasionally on my desktop when it looks like I need more swap (large graphics - gimp) - I would disagree that a swap partition is much faster - experience shows its more like much, much, much ... faster :) Not of much use on th FR, but swap partitions on different drives having the same priority use a parallel striping for read/write (like raid0) for a speedup. BillK ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
[SHR-Unstable] swapon: swapfile has holes
Hi there, I just installed SHR unstable and I'm impressed at how usable and responsive it is. However, while I was performing a opkg operation I ran out of memory so I tried to add a swap file. When following the instructions at: http://wiki.openmoko.org/wiki/SHR_User_Manual#SwapSpace I get the error: swapon: /swapfile: Invalid argument and dmesg shows: swapon: swapfile has holes I've tried files on the sd card and also on the internal memory. Any suggestions? Thanks. -Greg ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
