How to verify zswap running?
15
How can I check to verify that zswap is enabled and working on my system?
kernel
asked Aug 12 '14 at 22:47
Rucent88Rucent88
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15
How can I check to verify that zswap is enabled and working on my system?
kernel
asked Aug 12 '14 at 22:47
Rucent88Rucent88
99311325
add a comment |
15
15
15
2
How can I check to verify that zswap is enabled and working on my system?
kernel
asked Aug 12 '14 at 22:47
Rucent88Rucent88
99311325
How can I check to verify that zswap is enabled and working on my system?
kernel
kernel
asked Aug 12 '14 at 22:47
Rucent88Rucent88
99311325
asked Aug 12 '14 at 22:47
Rucent88Rucent88
99311325
asked Aug 12 '14 at 22:47
Rucent88Rucent88
99311325
asked Aug 12 '14 at 22:47
Rucent88Rucent88
99311325
asked Aug 12 '14 at 22:47
Rucent88Rucent88
99311325
99311325
add a comment |
add a comment |
2 Answers
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14
dmesg | grep zswap
That should be all you need to know if it's running. You should see a message along the lines of:
[ 1.241302] zswap: loading zswap
[ 1.241306] zswap: using zbud pool
[ 1.241310] zswap: using lzo compressor
You can see what it's doing with the following:
$ sudo grep -R . /sys/kernel/debug/zswap
/sys/kernel/debug/zswap/stored_pages:0
/sys/kernel/debug/zswap/pool_total_size:0
/sys/kernel/debug/zswap/duplicate_entry:0
/sys/kernel/debug/zswap/written_back_pages:0
/sys/kernel/debug/zswap/reject_compress_poor:0
/sys/kernel/debug/zswap/reject_kmemcache_fail:0
/sys/kernel/debug/zswap/reject_alloc_fail:0
/sys/kernel/debug/zswap/reject_reclaim_fail:0
/sys/kernel/debug/zswap/pool_limit_hit:0
The key parameters to look out for are stored_pages which is the number of compressed pages and written_back_pages which is the number of pages which have been written out to the swap file.
edited Aug 12 '18 at 9:19
davefiddes
1053
answered Aug 12 '14 at 22:56
Oli♦Oli
223k88564765
2
To add to this, you can check if zswap is actually doing anything with this command (zswap won't actually kick in until your system starts swapping):sudo sh -c 'cd /sys/kernel/debug/zswap; grep . *'
– bmaupin
May 19 '15 at 16:13
@bmaupin That command seems a little convoluted, why not:sudo grep . /sys/kernel/debug/zswap/*?
– Oli♦
May 19 '15 at 16:18
1
Just preference. They both work fine, but I prefer the cleaner output of mine.
– bmaupin
May 19 '15 at 16:22
1
I just noticed your command doesn't actually work, which is probably why mine seems convoluted:$ sudo grep . /sys/kernel/debug/zswap/*grep: /sys/kernel/debug/zswap/*: No such file or directory. At a minimum you would probably need to do:sudo sh -c 'grep . /sys/kernel/debug/zswap/*'
– bmaupin
Sep 10 '15 at 15:49
@bmaupin I can see the problem now, it's trying to expand in the parent shell (pre-sudo) but normal users don't have list/read permissions in/sys/kernel/debug/zswap. Can be fixed by telling grep to chow through the directory. See edit.
– Oli♦
Mar 2 '16 at 0:43
add a comment |
1
Shell expansion is a weird thing sometimes. grep fortunately have a recursive option so to simplify it:
sudo grep -r . /sys/kernel/debug/zswap
edited 5 hours ago
Alexey Vazhnov
9318
answered Jan 23 '17 at 15:55
Nikolay NaydenovNikolay Naydenov
111
add a comment |
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2 Answers
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14
dmesg | grep zswap
That should be all you need to know if it's running. You should see a message along the lines of:
[ 1.241302] zswap: loading zswap
[ 1.241306] zswap: using zbud pool
[ 1.241310] zswap: using lzo compressor
You can see what it's doing with the following:
$ sudo grep -R . /sys/kernel/debug/zswap
/sys/kernel/debug/zswap/stored_pages:0
/sys/kernel/debug/zswap/pool_total_size:0
/sys/kernel/debug/zswap/duplicate_entry:0
/sys/kernel/debug/zswap/written_back_pages:0
/sys/kernel/debug/zswap/reject_compress_poor:0
/sys/kernel/debug/zswap/reject_kmemcache_fail:0
/sys/kernel/debug/zswap/reject_alloc_fail:0
/sys/kernel/debug/zswap/reject_reclaim_fail:0
/sys/kernel/debug/zswap/pool_limit_hit:0
The key parameters to look out for are stored_pages which is the number of compressed pages and written_back_pages which is the number of pages which have been written out to the swap file.
edited Aug 12 '18 at 9:19
davefiddes
1053
answered Aug 12 '14 at 22:56
Oli♦Oli
223k88564765
2
To add to this, you can check if zswap is actually doing anything with this command (zswap won't actually kick in until your system starts swapping):sudo sh -c 'cd /sys/kernel/debug/zswap; grep . *'
– bmaupin
May 19 '15 at 16:13
@bmaupin That command seems a little convoluted, why not:sudo grep . /sys/kernel/debug/zswap/*?
– Oli♦
May 19 '15 at 16:18
1
Just preference. They both work fine, but I prefer the cleaner output of mine.
– bmaupin
May 19 '15 at 16:22
1
I just noticed your command doesn't actually work, which is probably why mine seems convoluted:$ sudo grep . /sys/kernel/debug/zswap/*grep: /sys/kernel/debug/zswap/*: No such file or directory. At a minimum you would probably need to do:sudo sh -c 'grep . /sys/kernel/debug/zswap/*'
– bmaupin
Sep 10 '15 at 15:49
@bmaupin I can see the problem now, it's trying to expand in the parent shell (pre-sudo) but normal users don't have list/read permissions in/sys/kernel/debug/zswap. Can be fixed by telling grep to chow through the directory. See edit.
– Oli♦
Mar 2 '16 at 0:43
add a comment |
14
dmesg | grep zswap
That should be all you need to know if it's running. You should see a message along the lines of:
[ 1.241302] zswap: loading zswap
[ 1.241306] zswap: using zbud pool
[ 1.241310] zswap: using lzo compressor
You can see what it's doing with the following:
$ sudo grep -R . /sys/kernel/debug/zswap
/sys/kernel/debug/zswap/stored_pages:0
/sys/kernel/debug/zswap/pool_total_size:0
/sys/kernel/debug/zswap/duplicate_entry:0
/sys/kernel/debug/zswap/written_back_pages:0
/sys/kernel/debug/zswap/reject_compress_poor:0
/sys/kernel/debug/zswap/reject_kmemcache_fail:0
/sys/kernel/debug/zswap/reject_alloc_fail:0
/sys/kernel/debug/zswap/reject_reclaim_fail:0
/sys/kernel/debug/zswap/pool_limit_hit:0
The key parameters to look out for are stored_pages which is the number of compressed pages and written_back_pages which is the number of pages which have been written out to the swap file.
edited Aug 12 '18 at 9:19
davefiddes
1053
answered Aug 12 '14 at 22:56
Oli♦Oli
223k88564765
2
To add to this, you can check if zswap is actually doing anything with this command (zswap won't actually kick in until your system starts swapping):sudo sh -c 'cd /sys/kernel/debug/zswap; grep . *'
– bmaupin
May 19 '15 at 16:13
@bmaupin That command seems a little convoluted, why not:sudo grep . /sys/kernel/debug/zswap/*?
– Oli♦
May 19 '15 at 16:18
1
Just preference. They both work fine, but I prefer the cleaner output of mine.
– bmaupin
May 19 '15 at 16:22
1
I just noticed your command doesn't actually work, which is probably why mine seems convoluted:$ sudo grep . /sys/kernel/debug/zswap/*grep: /sys/kernel/debug/zswap/*: No such file or directory. At a minimum you would probably need to do:sudo sh -c 'grep . /sys/kernel/debug/zswap/*'
– bmaupin
Sep 10 '15 at 15:49
@bmaupin I can see the problem now, it's trying to expand in the parent shell (pre-sudo) but normal users don't have list/read permissions in/sys/kernel/debug/zswap. Can be fixed by telling grep to chow through the directory. See edit.
– Oli♦
Mar 2 '16 at 0:43
add a comment |
14
14
14
dmesg | grep zswap
That should be all you need to know if it's running. You should see a message along the lines of:
[ 1.241302] zswap: loading zswap
[ 1.241306] zswap: using zbud pool
[ 1.241310] zswap: using lzo compressor
You can see what it's doing with the following:
$ sudo grep -R . /sys/kernel/debug/zswap
/sys/kernel/debug/zswap/stored_pages:0
/sys/kernel/debug/zswap/pool_total_size:0
/sys/kernel/debug/zswap/duplicate_entry:0
/sys/kernel/debug/zswap/written_back_pages:0
/sys/kernel/debug/zswap/reject_compress_poor:0
/sys/kernel/debug/zswap/reject_kmemcache_fail:0
/sys/kernel/debug/zswap/reject_alloc_fail:0
/sys/kernel/debug/zswap/reject_reclaim_fail:0
/sys/kernel/debug/zswap/pool_limit_hit:0
The key parameters to look out for are stored_pages which is the number of compressed pages and written_back_pages which is the number of pages which have been written out to the swap file.
edited Aug 12 '18 at 9:19
davefiddes
1053
answered Aug 12 '14 at 22:56
Oli♦Oli
223k88564765
dmesg | grep zswap
That should be all you need to know if it's running. You should see a message along the lines of:
[ 1.241302] zswap: loading zswap
[ 1.241306] zswap: using zbud pool
[ 1.241310] zswap: using lzo compressor
You can see what it's doing with the following:
$ sudo grep -R . /sys/kernel/debug/zswap
/sys/kernel/debug/zswap/stored_pages:0
/sys/kernel/debug/zswap/pool_total_size:0
/sys/kernel/debug/zswap/duplicate_entry:0
/sys/kernel/debug/zswap/written_back_pages:0
/sys/kernel/debug/zswap/reject_compress_poor:0
/sys/kernel/debug/zswap/reject_kmemcache_fail:0
/sys/kernel/debug/zswap/reject_alloc_fail:0
/sys/kernel/debug/zswap/reject_reclaim_fail:0
/sys/kernel/debug/zswap/pool_limit_hit:0
The key parameters to look out for are stored_pages which is the number of compressed pages and written_back_pages which is the number of pages which have been written out to the swap file.
edited Aug 12 '18 at 9:19
davefiddes
1053
answered Aug 12 '14 at 22:56
Oli♦Oli
223k88564765
edited Aug 12 '18 at 9:19
davefiddes
1053
edited Aug 12 '18 at 9:19
davefiddes
1053
edited Aug 12 '18 at 9:19
davefiddes
1053
1053
answered Aug 12 '14 at 22:56
Oli♦Oli
223k88564765
answered Aug 12 '14 at 22:56
Oli♦Oli
223k88564765
answered Aug 12 '14 at 22:56
Oli♦Oli
223k88564765
223k88564765
2
To add to this, you can check if zswap is actually doing anything with this command (zswap won't actually kick in until your system starts swapping):sudo sh -c 'cd /sys/kernel/debug/zswap; grep . *'
– bmaupin
May 19 '15 at 16:13
@bmaupin That command seems a little convoluted, why not:sudo grep . /sys/kernel/debug/zswap/*?
– Oli♦
May 19 '15 at 16:18
1
Just preference. They both work fine, but I prefer the cleaner output of mine.
– bmaupin
May 19 '15 at 16:22
1
I just noticed your command doesn't actually work, which is probably why mine seems convoluted:$ sudo grep . /sys/kernel/debug/zswap/*grep: /sys/kernel/debug/zswap/*: No such file or directory. At a minimum you would probably need to do:sudo sh -c 'grep . /sys/kernel/debug/zswap/*'
– bmaupin
Sep 10 '15 at 15:49
@bmaupin I can see the problem now, it's trying to expand in the parent shell (pre-sudo) but normal users don't have list/read permissions in/sys/kernel/debug/zswap. Can be fixed by telling grep to chow through the directory. See edit.
– Oli♦
Mar 2 '16 at 0:43
add a comment |
2
To add to this, you can check if zswap is actually doing anything with this command (zswap won't actually kick in until your system starts swapping):sudo sh -c 'cd /sys/kernel/debug/zswap; grep . *'
– bmaupin
May 19 '15 at 16:13
@bmaupin That command seems a little convoluted, why not:sudo grep . /sys/kernel/debug/zswap/*?
– Oli♦
May 19 '15 at 16:18
1
Just preference. They both work fine, but I prefer the cleaner output of mine.
– bmaupin
May 19 '15 at 16:22
1
I just noticed your command doesn't actually work, which is probably why mine seems convoluted:$ sudo grep . /sys/kernel/debug/zswap/*grep: /sys/kernel/debug/zswap/*: No such file or directory. At a minimum you would probably need to do:sudo sh -c 'grep . /sys/kernel/debug/zswap/*'
– bmaupin
Sep 10 '15 at 15:49
@bmaupin I can see the problem now, it's trying to expand in the parent shell (pre-sudo) but normal users don't have list/read permissions in/sys/kernel/debug/zswap. Can be fixed by telling grep to chow through the directory. See edit.
– Oli♦
Mar 2 '16 at 0:43
2
2
To add to this, you can check if zswap is actually doing anything with this command (zswap won't actually kick in until your system starts swapping):
sudo sh -c 'cd /sys/kernel/debug/zswap; grep . *'– bmaupin
May 19 '15 at 16:13
To add to this, you can check if zswap is actually doing anything with this command (zswap won't actually kick in until your system starts swapping):
sudo sh -c 'cd /sys/kernel/debug/zswap; grep . *'– bmaupin
May 19 '15 at 16:13
@bmaupin That command seems a little convoluted, why not:
sudo grep . /sys/kernel/debug/zswap/* ?– Oli♦
May 19 '15 at 16:18
@bmaupin That command seems a little convoluted, why not:
sudo grep . /sys/kernel/debug/zswap/* ?– Oli♦
May 19 '15 at 16:18
1
1
Just preference. They both work fine, but I prefer the cleaner output of mine.
– bmaupin
May 19 '15 at 16:22
Just preference. They both work fine, but I prefer the cleaner output of mine.
– bmaupin
May 19 '15 at 16:22
1
1
I just noticed your command doesn't actually work, which is probably why mine seems convoluted:
$ sudo grep . /sys/kernel/debug/zswap/* grep: /sys/kernel/debug/zswap/*: No such file or directory. At a minimum you would probably need to do: sudo sh -c 'grep . /sys/kernel/debug/zswap/*'– bmaupin
Sep 10 '15 at 15:49
I just noticed your command doesn't actually work, which is probably why mine seems convoluted:
$ sudo grep . /sys/kernel/debug/zswap/* grep: /sys/kernel/debug/zswap/*: No such file or directory. At a minimum you would probably need to do: sudo sh -c 'grep . /sys/kernel/debug/zswap/*'– bmaupin
Sep 10 '15 at 15:49
@bmaupin I can see the problem now, it's trying to expand in the parent shell (pre-sudo) but normal users don't have list/read permissions in
/sys/kernel/debug/zswap. Can be fixed by telling grep to chow through the directory. See edit.– Oli♦
Mar 2 '16 at 0:43
@bmaupin I can see the problem now, it's trying to expand in the parent shell (pre-sudo) but normal users don't have list/read permissions in
/sys/kernel/debug/zswap. Can be fixed by telling grep to chow through the directory. See edit.– Oli♦
Mar 2 '16 at 0:43
add a comment |
1
Shell expansion is a weird thing sometimes. grep fortunately have a recursive option so to simplify it:
sudo grep -r . /sys/kernel/debug/zswap
edited 5 hours ago
Alexey Vazhnov
9318
answered Jan 23 '17 at 15:55
Nikolay NaydenovNikolay Naydenov
111
add a comment |
1
Shell expansion is a weird thing sometimes. grep fortunately have a recursive option so to simplify it:
sudo grep -r . /sys/kernel/debug/zswap
edited 5 hours ago
Alexey Vazhnov
9318
answered Jan 23 '17 at 15:55
Nikolay NaydenovNikolay Naydenov
111
add a comment |
1
1
1
Shell expansion is a weird thing sometimes. grep fortunately have a recursive option so to simplify it:
sudo grep -r . /sys/kernel/debug/zswap
edited 5 hours ago
Alexey Vazhnov
9318
answered Jan 23 '17 at 15:55
Nikolay NaydenovNikolay Naydenov
111
Shell expansion is a weird thing sometimes. grep fortunately have a recursive option so to simplify it:
sudo grep -r . /sys/kernel/debug/zswap
edited 5 hours ago
Alexey Vazhnov
9318
answered Jan 23 '17 at 15:55
Nikolay NaydenovNikolay Naydenov
111
edited 5 hours ago
Alexey Vazhnov
9318
edited 5 hours ago
Alexey Vazhnov
9318
edited 5 hours ago
Alexey Vazhnov
9318
9318
answered Jan 23 '17 at 15:55
Nikolay NaydenovNikolay Naydenov
111
answered Jan 23 '17 at 15:55
Nikolay NaydenovNikolay Naydenov
111
answered Jan 23 '17 at 15:55
Nikolay NaydenovNikolay Naydenov
111
111
add a comment |
add a comment |
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