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IDS Forum

RE: Chunck writes

Posted By: Konikoff, Rob \(Contractor\)
Date: Tuesday, 19 April 2005, at 9:19 a.m.

In Response To: RE: Chunck writes (Simmons, Keith)

Although I don't do my own performance tuning (someone else much more
skilled in the mystical arts does this...), I use this little puppy for
a quick look at the engine logs to extract the checkpoint counts and
"average" checkpoint. We have guidelines for when to call the "Defense
Against The Dark Arts" teacher for performance tuning.

Caution: Check for word wrap if you copy/paste this and try to use it!

---Begin Snippet---
# *** extract a list of seconds from the enginlogs, get checkpoint count
grep Checkpoint ${ENGINELOGS}/enginelog.* | awk '{print $6 }' >
${TMP}/sec.txt

sec_cnt=`cat ${TMP}/sec.txt | wc -l`

$INFORMIXBIN/isql $DBNAME << !!
# *** make a temp table to check the time average
create temp table tmp_sec$$
(sec integer) with no log;
load from ${TMP}/sec.txt insert into tmp_sec$$;

# *** average second and load count check
select count(*) sec_cnt, "${sec_cnt}", avg(sec)
from tmp_sec$$
group by 2
;
drop table tmp_sec$$;
!!
---End Snippet---

Rob K

-----Original Message-----
From: forum.subscriber@iiug.org [mailto:forum.subscriber@iiug.org] On
Behalf Of Simmons, Keith
Sent: Tuesday, April 19, 2005 7:06 AM
To: ids@iiug.org
Subject: RE: Chunck writes [4752]

Leon

Checkpoints !!
Chunk Writes are good. It means all you disk writes are being done in
the
most efficient way during your checkpoints. Provided your checkpoints
are
in the order of 2-3 seconds you have nothing to worry about, you have a
reasonably well configured system.

Keith

-> -----Original Message-----
-> From: forum.subscriber@iiug.org [mailto:forum.subscriber@iiug.org]On
-> Behalf Of Leon
-> Sent: Tuesday, April 19, 2005 9:35 AM
-> To: ids@iiug.org
-> Subject: Chunck writes [4747]
->
->
-> Hello!
->
-> What can be a reason for big chunck writes.
-> Here is output with onstat -F|more.
->
-> Fg Writes LRU Writes Chunk Writes
-> 0 0 747145
->
-> address flusher state data
-> 7000000d04f3850 0 I 0 = 0X0
-> 7000000d04f4078 1 I 0 = 0X0
-> 7000000d04f48a0 2 I 0 = 0X0
-> 7000000d04f50c8 3 I 0 = 0X0
-> 7000000d04f58f0 4 I 0 = 0X0
-> 7000000d04f6118 5 I 0 = 0X0
-> 7000000d04f6940 6 I 0 = 0X0
-> 7000000d04f7168 7 I 0 = 0X0
-> 7000000d04f7990 8 I 0 = 0X0
-> 7000000d04f81b8 9 I 0 = 0X0
-> 7000000d04f89e0 10 I 0 = 0X0
-> 7000000d04f9208 11 I 0 = 0X0
-> 7000000d04f9a30 12 I 0 = 0X0
-> 7000000d04fa258 13 I 0 = 0X0
-> 7000000d04faa80 14 I 0 = 0X0
-> 7000000d04fb2a8 15 I 0 = 0X0
-> 7000000d04fbad0 16 I 0 = 0X0
->
->
->

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Messages In This Thread

  • Chunck writes
    Leon -- Tuesday, 19 April 2005, at 4:34 a.m.
    • AW: Chunck writes
      Andreas.KUTSCHE@spar.at -- Tuesday, 19 April 2005, at 5:44 a.m.
    • RE: Chunck writes
      Simmons, Keith -- Tuesday, 19 April 2005, at 7:05 a.m.
      • RE: Chunck writes
        Konikoff, Rob \(Contractor\) -- Tuesday, 19 April 2005, at 9:19 a.m.
    • Re: Chunck writes
      ART KAGEL, BLOOMBERG/ 731 LEXIN -- Tuesday, 19 April 2005, at 9:51 a.m.

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