Hi Managers,
We seem to have a problem with processes freeing up space. It appears to be
a OS level problem as we seem to run out of memory and swap. We have a ES40
with 3 GB memory and 6GB swap, V4.0F PK#3. To verify that we have a problem,
we ran the following experiment.
I would appreciate any thoughts you may have regarding what is happening.
Do we have a patch missing, or is this because of something else?
We used a large compressed file (> 380MB). Say AM.log.gz
Running
vmstat -w 5 12
produced the following output
Virtual Memory Statistics: (pagesize = 8192)
procs memory pages intr cpu
r w u act free wire fault cow pin pout in sy cs us sy id iowait
4 251 40 31K 333K 20K 1344 182 185 0 229 3K 3K 2 3 95 0
We ran gunzip on this large compressed file. After gunzip completed, it
gave us a huge file (3.2 GB). After gunzip exited, we ran vmstat again and
got the following output
Virtual Memory Statistics: (pagesize = 8192)
procs memory pages intr cpu
r w u act free wire fault cow pin pout in sy cs us sy id iowait
5 248 43 190K 174K 44K 1539 212 236 0 6K 2K 7K 6 11 83 0
Next we ran the command
cat AM.log > /var/tmp/tmp1
After this completed, we ran vmstat again and got the following output:
Virtual Memory Statistics: (pagesize = 8192)
procs memory pages intr cpu
r w u act free wire fault cow pin pout in sy cs us sy id iowait
5 243 40 339K 232 44K 1302 181 191 0 34 2K 2K 1 2 97 0
Now the system reached the same state it was in before we started to
gunzip and cat large files. But the amount of free memory was down to 278
pages (and we started to use swap, swap is configured in lazy mode).
Next all we did is /bin/rm /var/tmp/tmp1
The vmstat output after this is:
Virtual Memory Statistics: (pagesize = 8192)
procs memory pages intr cpu
r w u act free wire fault cow pin pout in sy cs us sy id iowait
4 244 40 192K 171K 20K 1274 166 176 10 55 2K 2K 1 6 93 0
Next we removed the large file (AM.log) that we got as a result of gunzip,
and ran vmstat to get
Virtual Memory Statistics: (pagesize = 8192)
procs memory pages intr cpu
r w u act free wire fault cow pin pout in sy cs us sy id iowait
4 244 40 35K 328K 20K 1279 165 176 0 47 2K 2K 1 5 95 0
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-- Narendra Ravi Email : narendra_at_spiff.hr.att.com
MT A4-4B27 Phone : 732-420-7792
Received on Mon Oct 09 2000 - 23:23:43 NZDT