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Dear 子逸 張,<br>
<br>
first of all I would like to remind you that there is a special
mailing list for such discussion.<br>
<br>
GPUs are nothing magic but simply massively parallel devices usually
attached to a CPU multi-core board. <br>
The complexity of accelerated systems requires a considerable
technological knowledge. <br>
If lacking of this fundamental component I strongly recommend to
keep considering the CPU version of the distribution, only.<br>
However, with good balance between CPU and GPU, high-end modern
technology and a significant computational workload, decent speed up
was registered while using GPU on top of the CPU platform.<br>
<br>
Kind regards,<br>
<br>
Ivan<br>
<br>
On 09/04/2014 11:19, 子逸 張 wrote:
<blockquote
cite="mid:1397035165.61979.YahooMailNeo@web75102.mail.tw1.yahoo.com"
type="cite">
<div style="color:#000; background-color:#fff;
font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial,
Lucida Grande, sans-serif;font-size:14pt">
<div>Hello,</div>
<div><br>
</div>
<div style="color: rgb(0, 0, 0); font-size: 19px; font-family:
HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida
Grande', sans-serif; background-color: transparent;
font-style: normal;">I have some questions about the <span
style="font-size: 14pt;">GPU </span><span
style="background-color: transparent; font-size: 14pt;">version
of </span><span style="background-color: transparent;">QE.</span></div>
<div style="color: rgb(0, 0, 0); font-size: 19px; font-family:
HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida
Grande', sans-serif; background-color: transparent;
font-style: normal;"><br>
</div>
<div style="color: rgb(0, 0, 0); font-size: 19px; font-family:
HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida
Grande', sans-serif; background-color: transparent;
font-style: normal;">In my testcases, GPU version of QE
didn't have good performance in acceleration. </div>
<div style="color: rgb(0, 0, 0); font-size: 19px; font-family:
HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida
Grande', sans-serif; background-color: transparent;
font-style: normal;"><span style="background-color:
transparent;"><br>
</span></div>
<div style="color: rgb(0, 0, 0); font-size: 19px; font-family:
HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida
Grande', sans-serif; background-color: transparent;
font-style: normal;"><span style="background-color:
transparent;">One of the testcases even run over 4 hours
without finishing.</span></div>
<div style="color: rgb(0, 0, 0); font-size: 19px; font-family:
HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida
Grande', sans-serif; background-color: transparent;
font-style: normal;"><br>
</div>
<div style="color: rgb(0, 0, 0); font-size: 19px; font-family:
HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida
Grande', sans-serif; background-color: transparent;
font-style: normal;">However in CPU version, it just took 33
minutes. (under 16 processes)</div>
<div style="color: rgb(0, 0, 0); font-size: 19px; font-family:
HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida
Grande', sans-serif; background-color: transparent;
font-style: normal;"><br>
</div>
<div style="color: rgb(0, 0, 0); font-size: 19px; font-family:
HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida
Grande', sans-serif; background-color: transparent;
font-style: normal;">I want to know that is this a standard
situation?</div>
<div style="color: rgb(0, 0, 0); font-size: 19px; font-family:
HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida
Grande', sans-serif; background-color: transparent;
font-style: normal;">or it is related to input file?</div>
<div style="color: rgb(0, 0, 0); font-size: 19px; font-family:
HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida
Grande', sans-serif; background-color: transparent;
font-style: normal;"><br>
</div>
<div style="color: rgb(0, 0, 0); font-size: 19px; font-family:
HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida
Grande', sans-serif; background-color: transparent;
font-style: normal;">thanks</div>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
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