Upper limit to bufreads?
Posted in 1999
Topics: General Discussion
The subject says it all. Does anyone know what the maximum value for
the "bufreads" field in onstat -p output is? From the output below
I seemed to have reached it but I'd like to be certain that there aren't
other issues lurking in the background.
It sure made a mess of my read cache %.
TIA.
Larry Kemmerling
Product Systems Engineer
AT&T Wireless Services
Aviation Communications Division
informix@bear:3 /home1/informix%!!
onstat -p
Informix Dynamic Server Version 7.31.UC2A -- On-Line -- Up 1 days 03:07:32 -- 1822320 Kbytes
Profile
dskreads pagreads bufreads %cached dskwrits pagwrits bufwrits %cached
3744865 29599073 4010804500 99.91 3798185 5931060 24313745 84.38
isamtot open start read write rewrite delete commit rollbk
3687244532 1480019 13343706 3548376175 2504815 1158956 1917991 1387069 133063
gp_read gp_write gp_rewrt gp_del gp_alloc gp_free gp_curs
0 0 0 0 0 0 0
ovlock ovuserthread ovbuff usercpu syscpu numckpts flushes
0 0 0 313379.15 5499.58 149 298
bufwaits lokwaits lockreqs deadlks dltouts ckpwaits compress seqscans
223279 108 104515784 0 0 420 398079 8049
ixda-RA idx-RA da-RA RA-pgsused lchwaits
506748 104967 416751 1004536 25945925
informix@bear:3 /home1/informix%!!
onstat -p
Informix Dynamic Server Version 7.31.UC2A -- On-Line -- Up 1 days 05:03:54 -- 1822320 Kbytes
Profile
dskreads pagreads bufreads %cached dskwrits pagwrits bufwrits %cached
3827144 29785525 61884553 93.82 3982606 6167107 25377485 84.31
isamtot open start read write rewrite delete commit rollbk
3998363262 1597235 13882027 3852435239 2656275 1269058 1917991 1479062 142581
gp_read gp_write gp_rewrt gp_del gp_alloc gp_free gp_curs
0 0 0 0 0 0 0
ovlock ovuserthread ovbuff usercpu syscpu numckpts flushes
0 0 0 337285.94 5795.33 155 310
bufwaits lokwaits lockreqs deadlks dltouts ckpwaits compress seqscans
235929 113 108580974 0 0 428 425459 8355
ixda-RA idx-RA da-RA RA-pgsused lchwaits
542324 110328 416751 1045474 27593103
Since 2^32=4294967296 i assume that bufreads is stored in a 32-Bit variable.
Regards
Wolf Pichler
Larry Kemmerling wrote:
> The subject says it all. Does anyone know what the maximum value for
> the "bufreads" field in onstat -p output is? From the output below
> I seemed to have reached it but I'd like to be certain that there aren't
> other issues lurking in the background.
>
> It sure made a mess of my read cache %.
>
> TIA.
>
> Larry Kemmerling
> Product Systems Engineer
> AT&T Wireless Services
> Aviation Communications Division
>
> informix@bear:3 /home1/informix%!!
> onstat -p>
> Informix Dynamic Server Version 7.31.UC2A -- On-Line -- Up 1 days 03:07:32 -- 1822320 Kbytes
>
> Profile
> dskreads pagreads bufreads %cached dskwrits pagwrits bufwrits %cached
> 3744865 29599073 4010804500 99.91 3798185 5931060 24313745 84.38
>
> isamtot open start read write rewrite delete commit rollbk
> 3687244532 1480019 13343706 3548376175 2504815 1158956 1917991 1387069 133063
>
> gp_read gp_write gp_rewrt gp_del gp_alloc gp_free gp_curs
> 0 0 0 0 0 0 0
>
> ovlock ovuserthread ovbuff usercpu syscpu numckpts flushes
> 0 0 0 313379.15 5499.58 149 298
>
> bufwaits lokwaits lockreqs deadlks dltouts ckpwaits compress seqscans
> 223279 108 104515784 0 0 420 398079 8049
>
> ixda-RA idx-RA da-RA RA-pgsused lchwaits
> 506748 104967 416751 1004536 25945925
>
> informix@bear:3 /home1/informix%!!
> onstat -p>
> Informix Dynamic Server Version 7.31.UC2A -- On-Line -- Up 1 days 05:03:54 -- 1822320 Kbytes
>
> Profile
> dskreads pagreads bufreads %cached dskwrits pagwrits bufwrits %cached
> 3827144 29785525 61884553 93.82 3982606 6167107 25377485 84.31
>
> isamtot open start read write rewrite delete commit rollbk
> 3998363262 1597235 13882027 3852435239 2656275 1269058 1917991 1479062 142581
>
> gp_read gp_write gp_rewrt gp_del gp_alloc gp_free gp_curs
> 0 0 0 0 0 0 0
>
> ovlock ovuserthread ovbuff usercpu syscpu numckpts flushes
> 0 0 0 337285.94 5795.33 155 310
>
> bufwaits lokwaits lockreqs deadlks dltouts ckpwaits compress seqscans
> 235929 113 108580974 0 0 428 425459 8355
>
> ixda-RA idx-RA da-RA RA-pgsused lchwaits
> 542324 110328 416751 1045474 27593103
--
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