Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtp (Exim 4.80) (envelope-from ) id 1VrE8m-0003oQ-W4 for pgsql-performance@arkaria.postgresql.org; Thu, 12 Dec 2013 21:49:55 +0000 Received: from localhost ([127.0.0.1] helo=postgresql.org) by malur.postgresql.org with smtp (Exim 4.80) (envelope-from ) id 1VrE8m-0001Xf-Ah for pgsql-performance@arkaria.postgresql.org; Thu, 12 Dec 2013 21:49:52 +0000 Received: from makus.postgresql.org ([2001:4800:7903:4::125]) by malur.postgresql.org with esmtp (Exim 4.80) (envelope-from ) id 1VrE8k-0001XU-A7 for pgsql-performance@postgresql.org; Thu, 12 Dec 2013 21:49:50 +0000 Received: from mail.brycecovertoperations.com ([198.199.108.214]) by makus.postgresql.org with esmtp (Exim 4.80) (envelope-from ) id 1VrE8f-0000W0-DV for pgsql-performance@postgresql.org; Thu, 12 Dec 2013 21:49:49 +0000 Received: from localhost (localhost [127.0.0.1]) by mail.brycecovertoperations.com (Postfix) with ESMTP id A677F1078BB for ; Thu, 12 Dec 2013 21:48:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d= brycecovertoperations.com; h=content-type:content-type :in-reply-to:references:subject:subject:to:mime-version :user-agent:from:from:date:date:message-id; s=dkim; t= 1386884888; x=1387748888; bh=TaODL903ijGGQiNlJofRNUjaDDPrPE5MNs1 dRA9Aat4=; b=hYPJ3UZm03UNkF6wcu1mwPrKieln+dVByv+CaCoxnyKafFXC0xh KDA/m1qYeCyiyKsi5pDcx1Fq671pZu4MTCu6VHPRe8v839AFHHbMh0i7xdOy5AKo dp7/V7mQT/fvQPBxYcezFOLl/iQI7w3Di+Rh8E/X5YzLNW1lA7sp31+s= X-Virus-Scanned: Debian amavisd-new at mail.brycecovertoperations.com Received: from mail.brycecovertoperations.com ([127.0.0.1]) by localhost (mail.brycecovertoperations.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id hwWBNDk5FW40 for ; Thu, 12 Dec 2013 21:48:08 +0000 (UTC) Received: from hulkbrogan-2.local (unknown [199.231.240.50]) by mail.brycecovertoperations.com (Postfix) with ESMTPSA id 81D8D1078AA; Thu, 12 Dec 2013 21:48:04 +0000 (UTC) Message-ID: <52AA2F71.2040608@brycecovertoperations.com> Date: Thu, 12 Dec 2013 13:49:37 -0800 From: Bryce Covert User-Agent: Postbox 3.0.8 (Macintosh/20130427) MIME-Version: 1.0 To: Claudio Freire CC: postgres performance list Subject: Re: Slow query due to slow I/O References: <52AA1836.6020208@brycecovertoperations.com> <52AA1AAA.1030901@brycecovertoperations.com> <52AA27AA.5040307@brycecovertoperations.com> In-Reply-To: Content-Type: multipart/alternative; boundary="------------040105030909060203060201" X-Pg-Spam-Score: -2.0 (--) List-Archive: List-Help: List-ID: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: X-Mailing-List: pgsql-performance Precedence: bulk Sender: pgsql-performance-owner@postgresql.org This is a multi-part message in MIME format. --------------040105030909060203060201 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit It's strange that it isn't sequential at least for the electric usage, as i've clustered using the index that it's using.. I had work_mem set to 128mb. I tried bumping it to 1024mb, and I don't think I see a in the query plan. Would you think upgrading to 9.2 would help much here? Using a covered index, I imagine reads would be limited quite a bit. Thanks again, Bryce > Claudio Freire > December 12, 2013 1:35 PM > > On Thu, Dec 12, 2013 at 6:16 PM, Bryce Covert > > wrote: > > > Thanks a lot for the help. I'm not familiar with explain buffers, > but here's the results: > > Limit (cost=0.00..648.71 rows=50 width=8) (actual > time=653.681..52328.707 rows=50 loops=1) > Buffers: shared hit=7875 read=9870 > -> GroupAggregate (cost=0.00..55672.36 rows=4291 width=8) > (actual time=653.671..52328.480 rows=50 loops=1) > > Filter: ((sum(electricusage.usage) >= 3284::numeric) AND > (sum(electricusage.usage) <= 3769::numeric)) > Buffers: shared hit=7875 read=9870 > -> Nested Loop (cost=0.00..55262.93 rows=34506 width=8) > (actual time=432.129..52200.465 rows=30711 loops=1) > Buffers: shared hit=7875 read=9870 > -> Index Scan using > premiseaccount_bucket_58c70392619aa36f on premiseaccount > premiseaccount (cost=0.00..15433.71 rows=4291 width=4) (actual > time=338.160..10014.780 rows=3437 loops=1) > Index Cond: ((bucket)::text = > '85349_single-family'::text) > Buffers: shared hit=744 read=2692 > -> Index Scan using > electricusage_premise_account_id on electricusage electricusage > (cost=0.00..9.17 rows=9 width=8) (actual time=11.430..12.235 > rows=9 loops=3437) > Index Cond: (premise_account_id = > premiseaccount.id ) > Filter: (from_date >= '2012-11-20 > 00:00:00+00'::timestamp with time zone) > Buffers: shared hit=7131 read=7178 > Total runtime: 52329.028 ms > (15 rows) > > and the iostat results... > Linux 3.11.6-x86_64-linode35 (preview-aps-new) 12/12/2013 > _x86_64_ (8 CPU) > > ... > > Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s > avgrq-sz avgqu-sz await r_await w_await svctm %util > xvda 0.10 47.10 152.40 7.80 2.20 > 0.21 30.92 1.36 8.50 8.03 17.53 6.14 98.33 > xvdb 0.00 0.00 0.00 0.00 0.00 > 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 > > > > This means it's doing random I/O, and that your disk is a single > 7200RPM drive (152 r/s being typical for that hardware). > > You can improve this by either: > > 1 - Turning that random I/O pattern into sequential, or > 2 - Getting better I/O. > > I'll assume 2 isn't available to you on linode, so for 1, you could > try lowering effective_cache_size substantially. It seems you're not > getting nearly as much caching as you think (ie 2GB). However, I doubt > there's a plan that can get you significantly better performance given > your hardware. > > You may shave a few seconds, though, if you increase work_mem. It > seems it should have used a bitmap index scan for at least one of the > index scans there, and a low work_mem could be what's limiting the > planner's possibilities. What are your settings in that area? > > > Bryce Covert > December 12, 2013 1:16 PM > Hey Claudio, > > Thanks a lot for the help. I'm not familiar with explain buffers, but > here's the results: > > Limit (cost=0.00..648.71 rows=50 width=8) (actual > time=653.681..52328.707 rows=50 loops=1) > Buffers: shared hit=7875 read=9870 > -> GroupAggregate (cost=0.00..55672.36 rows=4291 width=8) (actual > time=653.671..52328.480 rows=50 loops=1) > Filter: ((sum(electricusage.usage) >= 3284::numeric) AND > (sum(electricusage.usage) <= 3769::numeric)) > Buffers: shared hit=7875 read=9870 > -> Nested Loop (cost=0.00..55262.93 rows=34506 width=8) > (actual time=432.129..52200.465 rows=30711 loops=1) > Buffers: shared hit=7875 read=9870 > -> Index Scan using > premiseaccount_bucket_58c70392619aa36f on premiseaccount > premiseaccount (cost=0.00..15433.71 rows=4291 width=4) (actual > time=338.160..10014.780 rows=3437 loops=1) > Index Cond: ((bucket)::text = > '85349_single-family'::text) > Buffers: shared hit=744 read=2692 > -> Index Scan using electricusage_premise_account_id > on electricusage electricusage (cost=0.00..9.17 rows=9 width=8) > (actual time=11.430..12.235 rows=9 loops=3437) > Index Cond: (premise_account_id = premiseaccount.id) > Filter: (from_date >= '2012-11-20 > 00:00:00+00'::timestamp with time zone) > Buffers: shared hit=7131 read=7178 > Total runtime: 52329.028 ms > (15 rows) > > and the iostat results... > Linux 3.11.6-x86_64-linode35 (preview-aps-new) 12/12/2013 > _x86_64_ (8 CPU) > > Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s > avgrq-sz avgqu-sz await r_await w_await svctm %util > xvda 6.94 65.68 12.16 7.64 0.36 0.29 > 67.06 0.44 22.11 3.56 51.66 1.15 2.28 > xvdb 0.00 0.00 0.00 0.00 0.00 0.00 > 10.61 0.00 1.82 1.82 0.00 1.82 0.00 > > Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s > avgrq-sz avgqu-sz await r_await w_await svctm %util > xvda 0.10 47.10 152.40 7.80 2.20 0.21 > 30.92 1.36 8.50 8.03 17.53 6.14 98.33 > xvdb 0.00 0.00 0.00 0.00 0.00 0.00 > 0.00 0.00 0.00 0.00 0.00 0.00 0.00 > > Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s > avgrq-sz avgqu-sz await r_await w_await svctm %util > xvda 0.20 2.30 212.10 0.70 3.22 0.01 > 31.09 1.47 6.88 6.90 2.86 4.63 98.62 > xvdb 0.00 0.00 0.00 0.00 0.00 0.00 > 0.00 0.00 0.00 0.00 0.00 0.00 0.00 > > Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s > avgrq-sz avgqu-sz await r_await w_await svctm %util > xvda 0.20 8.30 183.20 5.10 2.46 0.05 > 27.31 1.68 8.85 6.68 86.78 5.24 98.70 > xvdb 0.00 0.00 0.00 0.00 0.00 0.00 > 0.00 0.00 0.00 0.00 0.00 0.00 0.00 > > Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s > avgrq-sz avgqu-sz await r_await w_await svctm %util > xvda 0.10 0.00 165.70 0.00 2.36 0.00 > 29.20 1.46 8.86 8.86 0.00 5.95 98.63 > xvdb 0.00 0.00 0.00 0.00 0.00 0.00 > 0.00 0.00 0.00 0.00 0.00 0.00 0.00 > > I'm not sure how to process this except that 2.5MB/s seems really > slow, and it looks like it is using postgres' cache quite a bit. > > Thanks, > Bryce > > > Claudio Freire > December 12, 2013 12:48 PM > > > > Well, did you run benchmarks? How many IOPS do you get from the volumes? > > Try running "iostat -x -m -d 10" while the slow query is running and > pasting the results (or a relevant sample of them). > > Also, do run "explain (analyze, buffers)" instead of plain "explain > analyze". > > Bryce Covert > December 12, 2013 12:20 PM > > I don't have much info on disks, since this is a virtual server on > linode. It is running ubuntu 12.04, 8cpus, 4GB ram, 95GB ext3 volume > (noatime). Hopefully that's helpful. > > Bryce > Claudio Freire > December 12, 2013 12:15 PM > On Thu, Dec 12, 2013 at 5:10 PM, Bryce Covert > > > For this kind of diagnostic, you need to include hardware details. > > OS? Disks? RAID? > > --------------040105030909060203060201 Content-Type: multipart/related; boundary="------------090705010201030202050309" --------------090705010201030202050309 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit
It's strange that it isn't sequential at least for the electric usage, as i've clustered using the index that it's using..

I had work_mem set to 128mb. I tried bumping it to 1024mb, and I don't think I see a in the query plan.

Would you think upgrading to 9.2 would help much here? Using a covered index, I imagine reads would be limited quite a bit.

Thanks again,
Bryce
December 12, 2013 1:35 PM

On Thu, Dec 12, 2013 at 6:16 PM, Bryce Covert <bryce@brycecovertoperations.com> wrote:

Thanks a lot for the help. I'm not familiar with explain buffers, but here's the results:

 Limit  (cost=0.00..648.71 rows=50 width=8) (actual time=653.681..52328.707 rows=50 loops=1)
   Buffers: shared hit=7875 read=9870
   ->  GroupAggregate  (cost=0.00..55672.36 rows=4291 width=8) (actual time=653.671..52328.480 rows=50 loops=1)

         Filter: ((sum(electricusage.usage) >= 3284::numeric) AND (sum(electricusage.usage) <= 3769::numeric))
         Buffers: shared hit=7875 read=9870
         ->  Nested Loop  (cost=0.00..55262.93 rows=34506 width=8) (actual time=432.129..52200.465 rows=30711 loops=1)
               Buffers: shared hit=7875 read=9870
               ->  Index Scan using premiseaccount_bucket_58c70392619aa36f on premiseaccount premiseaccount  (cost=0.00..15433.71 rows=4291 width=4) (actual time=338.160..10014.780 rows=3437 loops=1)
                     Index Cond: ((bucket)::text = '85349_single-family'::text)
                     Buffers: shared hit=744 read=2692
               ->  Index Scan using electricusage_premise_account_id on electricusage electricusage  (cost=0.00..9.17 rows=9 width=8) (actual time=11.430..12.235 rows=9 loops=3437)
                     Index Cond: (premise_account_id = premiseaccount.id)
                     Filter: (from_date >= '2012-11-20 00:00:00+00'::timestamp with time zone)
                     Buffers: shared hit=7131 read=7178
 Total runtime: 52329.028 ms
(15 rows)

and the iostat results...
Linux 3.11.6-x86_64-linode35 (preview-aps-new)     12/12/2013     _x86_64_    (8 CPU)

...
Device:         rrqm/s   wrqm/s     r/s     w/s    rMB/s    wMB/s avgrq-sz avgqu-sz   await r_await w_await  svctm  %util
xvda              0.10    47.10  152.40    7.80     2.20     0.21    30.92     1.36    8.50    8.03   17.53   6.14  98.33
xvdb              0.00     0.00    0.00    0.00     0.00     0.00     0.00     0.00    0.00    0.00    0.00   0.00   0.00


This means it's doing random I/O, and that your disk is a single 7200RPM drive (152 r/s being typical for that hardware).

You can improve this by either:

1 - Turning that random I/O pattern into sequential, or
2 - Getting better I/O.

I'll assume 2 isn't available to you on linode, so for 1, you could try lowering effective_cache_size substantially. It seems you're not getting nearly as much caching as you think (ie 2GB). However, I doubt there's a plan that can get you significantly better performance given your hardware.

You may shave a few seconds, though, if you increase work_mem. It seems it should have used a bitmap index scan for at least one of the index scans there, and a low work_mem could be what's limiting the planner's possibilities. What are your settings in that area?


December 12, 2013 1:16 PM
Hey Claudio,

Thanks a lot for the help. I'm not familiar with explain buffers, but here's the results:

 Limit  (cost=0.00..648.71 rows=50 width=8) (actual time=653.681..52328.707 rows=50 loops=1)
   Buffers: shared hit=7875 read=9870
   ->  GroupAggregate  (cost=0.00..55672.36 rows=4291 width=8) (actual time=653.671..52328.480 rows=50 loops=1)
         Filter: ((sum(electricusage.usage) >= 3284::numeric) AND (sum(electricusage.usage) <= 3769::numeric))
         Buffers: shared hit=7875 read=9870
         ->  Nested Loop  (cost=0.00..55262.93 rows=34506 width=8) (actual time=432.129..52200.465 rows=30711 loops=1)
               Buffers: shared hit=7875 read=9870
               ->  Index Scan using premiseaccount_bucket_58c70392619aa36f on premiseaccount premiseaccount  (cost=0.00..15433.71 rows=4291 width=4) (actual time=338.160..10014.780 rows=3437 loops=1)
                     Index Cond: ((bucket)::text = '85349_single-family'::text)
                     Buffers: shared hit=744 read=2692
               ->  Index Scan using electricusage_premise_account_id on electricusage electricusage  (cost=0.00..9.17 rows=9 width=8) (actual time=11.430..12.235 rows=9 loops=3437)
                     Index Cond: (premise_account_id = premiseaccount.id)
                     Filter: (from_date >= '2012-11-20 00:00:00+00'::timestamp with time zone)
                     Buffers: shared hit=7131 read=7178
 Total runtime: 52329.028 ms
(15 rows)

and the iostat results...
Linux 3.11.6-x86_64-linode35 (preview-aps-new)     12/12/2013     _x86_64_    (8 CPU)

Device:         rrqm/s   wrqm/s     r/s     w/s    rMB/s    wMB/s avgrq-sz avgqu-sz   await r_await w_await  svctm  %util
xvda              6.94    65.68   12.16    7.64     0.36     0.29    67.06     0.44   22.11    3.56   51.66   1.15   2.28
xvdb              0.00     0.00    0.00    0.00     0.00     0.00    10.61     0.00    1.82    1.82    0.00   1.82   0.00

Device:         rrqm/s   wrqm/s     r/s     w/s    rMB/s    wMB/s avgrq-sz avgqu-sz   await r_await w_await  svctm  %util
xvda              0.10    47.10  152.40    7.80     2.20     0.21    30.92     1.36    8.50    8.03   17.53   6.14  98.33
xvdb              0.00     0.00    0.00    0.00     0.00     0.00     0.00     0.00    0.00    0.00    0.00   0.00   0.00

Device:         rrqm/s   wrqm/s     r/s     w/s    rMB/s    wMB/s avgrq-sz avgqu-sz   await r_await w_await  svctm  %util
xvda              0.20     2.30  212.10    0.70     3.22     0.01    31.09     1.47    6.88    6.90    2.86   4.63  98.62
xvdb              0.00     0.00    0.00    0.00     0.00     0.00     0.00     0.00    0.00    0.00    0.00   0.00   0.00

Device:         rrqm/s   wrqm/s     r/s     w/s    rMB/s    wMB/s avgrq-sz avgqu-sz   await r_await w_await  svctm  %util
xvda              0.20     8.30  183.20    5.10     2.46     0.05    27.31     1.68    8.85    6.68   86.78   5.24  98.70
xvdb              0.00     0.00    0.00    0.00     0.00     0.00     0.00     0.00    0.00    0.00    0.00   0.00   0.00

Device:         rrqm/s   wrqm/s     r/s     w/s    rMB/s    wMB/s avgrq-sz avgqu-sz   await r_await w_await  svctm  %util
xvda              0.10     0.00  165.70    0.00     2.36     0.00    29.20     1.46    8.86    8.86    0.00   5.95  98.63
xvdb              0.00     0.00    0.00    0.00     0.00     0.00     0.00     0.00    0.00    0.00    0.00   0.00   0.00

I'm not sure how to process this except that 2.5MB/s seems really slow, and it looks like it is using postgres' cache quite a bit.

Thanks,
Bryce


December 12, 2013 12:48 PM



Well, did you run benchmarks? How many IOPS do you get from the volumes?

Try running "iostat -x -m -d 10" while the slow query is running and pasting the results (or a relevant sample of them).

Also, do run "explain (analyze, buffers)" instead of plain "explain analyze".

December 12, 2013 12:20 PM

I don't have much info on disks, since this is a virtual server on linode. It is running ubuntu 12.04, 8cpus, 4GB ram, 95GB ext3 volume (noatime). Hopefully that's helpful.

Bryce
December 12, 2013 12:15 PM
On Thu, Dec 12, 2013 at 5:10 PM, Bryce Covert


For this kind of diagnostic, you need to include hardware details.

OS? Disks? RAID?


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