Re: Raising Thread Priority

From:

"Alexander Grigoriev" <alegr@earthlink.net>

Newsgroups:

microsoft.public.vc.mfc

Date:

Thu, 18 Oct 2007 20:00:39 -0700

Message-ID:

<eFKS#wfEIHA.1188@TK2MSFTNGP04.phx.gbl>

This is a multi-part message in MIME format.

------=_NextPart_000_00F2_01C811C1.8EA64200
Content-Type: text/plain;
    charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

This just means your real bottleneck is disk access, not CPU alottment. =
You won't gain by increasing thread priority.
  "jmarc" <jmarc@incursion-voyages.com> wrote in message =
news:PZLRi.11358$GO5.391@edtnps90...
  Thanks,

  I know pretty about priority (unix)
  but you enlighted me, for the
  relative split time within the same
  process.

  I'll take a look for how to use
  SetPriorityClass instead..

  My app is not working on local
  disk. But in network disk. I know
  the relative lost of efficiency by
  this.

  Using SetPriorityClass, if I correctly
  use it, will show if any room for
  processing improvement still there.

  Thanks

  jmarc..

    "Scott McPhillips [MVP]" <org-dot-mvps-at-scottmcp> wrote in message =
news:%23yFHVKaEIHA.3548@TK2MSFTNGP06.phx.gbl...
    "jmarc" <jmarc@incursion-voyages.com> wrote in message =
news:mUKRi.11348$GO5.6235@edtnps90...
      I would just to raise 'above normal'
      my application (main thread).

      I use the SetThreadPriority function
      to raise it, but nothing change. Using
      GetThreadPriority before and after
      shown the priority level has not being
      changed!

      My app is working over 2 hours, just
      digging alone in memory, and the CPU
      is not really more than 30%. My app
      is not creating and destructing lots of
      object. Almost all memory is allocated
      prior my app is transforming a medium
      size database data into another one.

      So, not much IOs are involved. Working
      at higer level might split down significantly
      the 2 hours time for that conversion...!

      Any suggest on how to use the
      SetThreadPriority function, or something
      else might be better...?

      Thanks

      jamrc...

    SetThreadPriority sets a priority relative to the application's =
priority class, which means a relative priority with respect to other =
threads within your process.

    To get an absolute boost in priority you would need to call =
SetPriorityClass for your application.

    But if your CPU is at 30% and nothing else is going on it indicates =
you are probably disk (or network) bound.

    --
    Scott McPhillips [VC++ MVP]
------=_NextPart_000_00F2_01C811C1.8EA64200
Content-Type: text/html;
    charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; =
charset=iso-8859-1">
<META content="MSHTML 6.00.6000.16544" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff>
<DIV><FONT size=2>This just means your real bottleneck is disk access, =
not CPU
alottment. You won't gain by increasing thread priority.</FONT></DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
  <DIV>"jmarc" <<A
  =
href="mailto:jmarc@incursion-voyages.com">jmarc@incursion-voyages.com</=
A>>
  wrote in message <A
  =
href="news:PZLRi.11358$GO5.391@edtnps90">news:PZLRi.11358$GO5.391@edtnp=
s90</A>...</DIV>
  <DIV><FONT face=Arial size=2>Thanks,</FONT></DIV>
  <DIV><FONT face=Arial size=2></FONT> </DIV>
  <DIV><FONT face=Arial size=2>I know pretty about priority =
(unix)</FONT></DIV>
  <DIV><FONT face=Arial size=2>but you enlighted me, for =
the</FONT></DIV>
  <DIV><FONT face=Arial size=2>relative split time within the =
same</FONT></DIV>
  <DIV><FONT face=Arial size=2>process.</FONT></DIV>
  <DIV><FONT face=Arial size=2></FONT> </DIV>
  <DIV><FONT face=Arial size=2>I'll take a look for how to =
use</FONT></DIV>
  <DIV><FONT face=Arial size=2>SetPriorityClass =
instead..</FONT></DIV>
  <DIV><FONT face=Arial size=2></FONT> </DIV>
  <DIV><FONT face=Arial size=2>My app is not working on =
local</FONT></DIV>
  <DIV><FONT face=Arial size=2>disk.  But in network =
disk.  I
  know</FONT></DIV>
  <DIV><FONT face=Arial size=2>the relative lost of efficiency =
by</FONT></DIV>
  <DIV><FONT face=Arial size=2>this.</FONT></DIV>
  <DIV><FONT face=Arial size=2></FONT> </DIV>
  <DIV><FONT face=Arial size=2>Using SetPriorityClass, if I
  correctly</FONT></DIV>
  <DIV><FONT face=Arial size=2>use it, will show if any room =
for</FONT></DIV>
  <DIV><FONT face=Arial size=2>processing improvement still =
there.</FONT></DIV>
  <DIV><FONT face=Arial size=2></FONT> </DIV>
  <DIV><FONT face=Arial size=2>Thanks</FONT></DIV>
  <DIV><FONT face=Arial size=2></FONT> </DIV>
  <DIV><FONT face=Arial size=2>jmarc..</FONT></DIV>
  <DIV><FONT face=Arial size=2></FONT> </DIV>
  <DIV><FONT face=Arial size=2></FONT> </DIV>
  <DIV><FONT face=Arial size=2></FONT> </DIV>
  <BLOCKQUOTE dir=ltr
  style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
    <DIV>"Scott McPhillips [MVP]" <org-dot-mvps-at-scottmcp> wrote =
in
    message <A
    =
href="news:%23yFHVKaEIHA.3548@TK2MSFTNGP06.phx.gbl">news:%23yFHVKaEIHA.=
3548@TK2MSFTNGP06.phx.gbl</A>...</DIV>
    <DIV>"jmarc" <<A
    =
href="mailto:jmarc@incursion-voyages.com">jmarc@incursion-voyages.com</=
A>>
    wrote in message <A
    =
href="news:mUKRi.11348$GO5.6235@edtnps90">news:mUKRi.11348$GO5.6235@edt=
nps90</A>...</DIV>
    <BLOCKQUOTE dir=ltr
    style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
      <DIV><FONT face=Arial size=2>I would just to raise 'above
      normal'</FONT></DIV>
      <DIV><FONT face=Arial size=2>my application (main =
thread).</FONT></DIV>
      <DIV><FONT face=Arial size=2></FONT> </DIV>
      <DIV><FONT face=Arial size=2>I use the SetThreadPriority
      function</FONT></DIV>
      <DIV><FONT face=Arial size=2>to raise it, but nothing =
change. 
      Using</FONT></DIV>
      <DIV><FONT face=Arial size=2>GetThreadPriority before and
      after</FONT></DIV>
      <DIV><FONT face=Arial size=2>shown the priority level has not
      being</FONT></DIV>
      <DIV><FONT face=Arial size=2>changed!</FONT></DIV>
      <DIV><FONT face=Arial size=2></FONT> </DIV>
      <DIV><FONT face=Arial size=2>My app is working over 2 hours, =
just
      </FONT></DIV>
      <DIV><FONT face=Arial size=2>digging alone in memory, and the
      CPU</FONT></DIV>
      <DIV><FONT face=Arial size=2>is not really more than =
30%.  My
      app</FONT></DIV>
      <DIV><FONT face=Arial size=2>is not creating and destructing =
lots
      of</FONT></DIV>
      <DIV><FONT face=Arial size=2>object.  Almost all memory =
is
      allocated</FONT></DIV>
      <DIV><FONT face=Arial size=2>prior my app is transforming a
      medium</FONT></DIV>
      <DIV><FONT face=Arial size=2>size database </FONT><FONT =
face=Arial
      size=2>data into another one.</FONT></DIV>
      <DIV><FONT face=Arial size=2></FONT> </DIV>
      <DIV><FONT face=Arial size=2>So, not much IOs are =
involved. 
      Working</FONT></DIV>
      <DIV><FONT face=Arial size=2>at higer level might split down
      significantly</FONT></DIV>
      <DIV><FONT face=Arial size=2>the 2 hours time for that
      conversion...!</FONT></DIV>
      <DIV><FONT face=Arial size=2></FONT> </DIV>
      <DIV><FONT face=Arial size=2>Any suggest on how to use =
the</FONT></DIV>
      <DIV><FONT face=Arial size=2>SetThreadPriority function, or
      something</FONT></DIV>
      <DIV><FONT face=Arial size=2>else might be =
better...?</FONT></DIV>
      <DIV><FONT face=Arial size=2></FONT> </DIV>
      <DIV><FONT face=Arial size=2>Thanks</FONT></DIV>
      <DIV><FONT face=Arial size=2></FONT> </DIV>
      <DIV><FONT face=Arial size=2>jamrc...</FONT></DIV>
      <DIV><FONT face=Arial size=2></FONT> </DIV></BLOCKQUOTE>
    <DIV><FONT face=Arial size=2>SetThreadPriority sets a priority =
relative to
    the application's priority class, which means a relative priority =
with
    respect to other threads within your process.  </FONT></DIV>
    <DIV><FONT face=Arial size=2></FONT> </DIV>
    <DIV><FONT face=Arial size=2>To get an absolute boost in =
priority you would
    need to call SetPriorityClass for your application.</FONT></DIV>
    <DIV><FONT face=Arial size=2></FONT> </DIV>
    <DIV><FONT face=Arial size=2>But if your CPU is at 30% and =
nothing else is
    going on it indicates you are probably disk (or network)
    bound.</FONT></DIV>
    <DIV><FONT face=Arial size=2></FONT> </DIV>
    <DIV>-- <BR>Scott McPhillips [VC++
MVP]</DIV></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>

------=_NextPart_000_00F2_01C811C1.8EA64200--