Nginx worker processors D state and high I/O utilization !!
shahzaib shahzaib
shahzaib.cb at gmail.com
Tue Jul 16 05:10:50 UTC 2013
We're using 4XSata HDD 7200 rpm and yes it is hardly crossing 20MB/sec.
Could you please guide me a bit about the Max speed of SATA read?
Thanks for prompt reply.
On Tue, Jul 16, 2013 at 10:06 AM, Steve Holdoway <steve at greengecko.co.nz>wrote:
> Your disk maxes out at 20MB/sec read?
>
> On Tue, 2013-07-16 at 09:59 +0500, shahzaib shahzaib wrote:
> > Hello,
> >
> >
> > We're using nginx-1.2.8 to serve large static files for video
> > streaming. However all nginx worker_processes are in "D" state and HDD
> > I/O utilization is 99%.
> >
> > [root at DNTX010 ~]# ps aux |grep nginx
> > root 3046 0.0 0.0 20272 688 ? Ss 20:39 0:00
> > nginx: master process nginx
> > nginx 3047 3.2 0.9 94480 74808 ? D 20:39 0:03
> > nginx: worker process
> > nginx 3048 1.4 0.3 52104 31388 ? D 20:39 0:01
> > nginx: worker process
> > nginx 3049 0.2 0.1 33156 12156 ? S 20:39 0:00
> > nginx: worker process
> > nginx 3050 0.1 0.1 29968 8844 ? D 20:39 0:00
> > nginx: worker process
> > nginx 3051 0.2 0.1 30332 10076 ? D 20:39 0:00
> > nginx: worker process
> > nginx 3052 2.7 0.8 91788 69504 ? D 20:39 0:02
> > nginx: worker process
> > nginx 3053 0.3 0.0 25632 5384 ? D 20:39 0:00
> > nginx: worker process
> > nginx 3054 0.2 0.1 36032 15852 ? D 20:39 0:00
> > nginx: worker process
> > nginx 3055 0.4 0.2 37592 17396 ? D 20:39 0:00
> > nginx: worker process
> > nginx 3056 0.2 0.1 32580 11028 ? S 20:39 0:00
> > nginx: worker process
> > nginx 3057 0.3 0.2 39288 19116 ? D 20:39 0:00
> > nginx: worker process
> > nginx 3058 0.3 0.2 41764 19744 ? D 20:39 0:00
> > nginx: worker process
> > nginx 3059 0.3 0.1 31124 10480 ? D 20:39 0:00
> > nginx: worker process
> > nginx 3060 1.0 0.3 52736 31776 ? D 20:39 0:01
> > nginx: worker process
> > nginx 3061 1.1 0.3 51920 29956 ? D 20:39 0:01
> > nginx: worker process
> > nginx 3062 1.6 0.4 58808 35548 ? D 20:39 0:01
> > nginx: worker process
> >
> >
> > [root at DNTX010 ~]# iostat -x -d 3
> > Linux 2.6.32-358.6.2.el6.x86_64 (DNTX010.local) 07/16/2013
> > _x86_64_ (8 CPU)
> >
> > Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s
> > avgrq-sz avgqu-sz await svctm %util
> > sda 30.28 177.37 260.32 2.96 38169.26 1442.70
> > 150.46 2.29 8.70 3.52 92.78
> >
> > Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s
> > avgrq-sz avgqu-sz await svctm %util
> > sda 4.33 0.00 544.00 0.00 34376.00 0.00
> > 63.19 43.83 75.25 1.84 100.00
> >
> > Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s
> > avgrq-sz avgqu-sz await svctm %util
> > sda 9.00 6.33 547.67 0.67 34637.33 56.00
> > 63.27 48.01 86.20 1.82 100.00
> >
> > Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s
> > avgrq-sz avgqu-sz await svctm %util
> > sda 0.00 0.67 568.00 2.33 36024.00 29.33
> > 63.21 54.98 101.10 1.75 100.00
> >
> > Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s
> > avgrq-sz avgqu-sz await svctm %util
> > sda 0.00 4.33 560.33 1.33 35712.00 45.33
> > 63.66 37.20 65.06 1.78 100.00
> >
> >
> >
> > Nginx.conf :
> >
> > http {
> > include mime.types;
> > default_type application/octet-stream;
> > client_body_buffer_size 128K;
> > sendfile_max_chunk 128k;
> > client_max_body_size 800m;
> > client_header_buffer_size 256k;
> > large_client_header_buffers 4 256k;
> > output_buffers 1 512k;
> > server_tokens off; #Conceals nginx version
> > #access_log logs/access.log main;
> > access_log off;
> > error_log warn;
> > sendfile on;
> >
> > # aio on;
> >
> > # directio 512k;
> >
> > ignore_invalid_headers on;
> > client_header_timeout 3m;
> > client_body_timeout 3m;
> > send_timeout 3m;
> > keepalive_timeout 0;
> > reset_timedout_connection on;
> > }
> >
> >
> > We've also tried enabling aio directive but nothing changed. Help will
> > be highly appreciated.
> >
> >
> > Thanks
> > Shahzaib
> >
> >
> > _______________________________________________
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> > nginx at nginx.org
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>
> --
> Steve Holdoway BSc(Hons) MNZCS
> http://www.greengecko.co.nz
> Linkedin: http://www.linkedin.com/in/steveholdoway
> Skype: sholdowa
>
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