--_000_b04cf8b58a7a49189a5c21f1a05b1b84CD1001M21corpads_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable On a cluster I can configure Memory Optimization "for server loads" (150% o= vercommit) or "for desktop loads" (200% overcommit). This relates to memory page sharing right? If so what's the downside of ju= st setting it as high as possible? Thanks, Ryan --_000_b04cf8b58a7a49189a5c21f1a05b1b84CD1001M21corpads_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable <html xmlns:v=3D"urn:schemas-microsoft-com:vml" xmlns:o=3D"urn:schemas-micr= osoft-com:office:office" xmlns:w=3D"urn:schemas-microsoft-com:office:word" = xmlns:m=3D"http://schemas.microsoft.com/office/2004/12/omml" xmlns=3D"http:= //www.w3.org/TR/REC-html40"> <head> <meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dus-ascii"=
<meta name=3D"Generator" content=3D"Microsoft Word 14 (filtered medium)"> <style><!-- /* Font Definitions */ @font-face {font-family:"Century Gothic"; panose-1:2 11 5 2 2 2 2 2 2 4;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {margin:0in; margin-bottom:.0001pt; font-size:12.0pt; font-family:"Times New Roman","serif";} a:link, span.MsoHyperlink {mso-style-priority:99; color:blue; text-decoration:underline;} a:visited, span.MsoHyperlinkFollowed {mso-style-priority:99; color:purple; text-decoration:underline;} span.EmailStyle17 {mso-style-type:personal-compose; font-family:"Century Gothic","sans-serif"; color:windowtext;} .MsoChpDefault {mso-style-type:export-only; font-family:"Calibri","sans-serif";} @page WordSection1 {size:8.5in 11.0in; margin:1.0in 1.0in 1.0in 1.0in;} div.WordSection1 {page:WordSection1;} --></style><!--[if gte mso 9]><xml> <o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" /> </xml><![endif]--><!--[if gte mso 9]><xml> <o:shapelayout v:ext=3D"edit"> <o:idmap v:ext=3D"edit" data=3D"1" /> </o:shapelayout></xml><![endif]--> </head> <body lang=3D"EN-US" link=3D"blue" vlink=3D"purple"> <div class=3D"WordSection1"> <p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ce= ntury Gothic","sans-serif"">On a cluster I can configure Mem= ory Optimization “for server loads” (150% overcommit) or “= ;for desktop loads” (200% overcommit).<o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ce= ntury Gothic","sans-serif"">This relates to memory page shar= ing right? If so what’s the downside of just setting it as high= as possible?<o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ce= ntury Gothic","sans-serif""><o:p> </o:p></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ce= ntury Gothic","sans-serif"">Thanks,<o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ce= ntury Gothic","sans-serif"">Ryan</span><span style=3D"font-s= ize:10.0pt;font-family:"Century Gothic","sans-serif""><= o:p></o:p></span></p> </div> </body> </html> --_000_b04cf8b58a7a49189a5c21f1a05b1b84CD1001M21corpads_--
This is a multi-part message in MIME format. --------------050303090808090506060702 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit On 09/29/2015 06:14 PM, Groten, Ryan wrote:
On a cluster I can configure Memory Optimization “for server loads” (150% overcommit) or “for desktop loads” (200% overcommit).
This relates to memory page sharing right? If so what’s the downside of just setting it as high as possible?
This is how much more memory you will use to create VMs. Using 150%, a hypervisor with 10GB of RAM will run up to 15 x 1GB VMs or 10 x 1,5GB VMs and so on. If it happens all VMs using all memory in the same time, you have KSM working to deduplicate memory pages and, as a last resource, enough swap to avoid the oom killer. The best setting here depends on your workload. If you already know your VMs will use all memory they have, so the less the better. If you want a big number of VMs and they are not going to stress the memory that much, you can play with the values and find what fits better for you.
Thanks,
Ryan
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--------------050303090808090506060702 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit <html> <head> <meta content="text/html; charset=utf-8" http-equiv="Content-Type"> </head> <body bgcolor="#FFFFFF" text="#000000"> <div class="moz-cite-prefix">On 09/29/2015 06:14 PM, Groten, Ryan wrote:<br> </div> <blockquote cite="mid:b04cf8b58a7a49189a5c21f1a05b1b84@CD1001-M21.corp.ads" type="cite"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <meta name="Generator" content="Microsoft Word 14 (filtered medium)"> <style><!-- /* Font Definitions */ @font-face {font-family:"Century Gothic"; panose-1:2 11 5 2 2 2 2 2 2 4;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {margin:0in; margin-bottom:.0001pt; font-size:12.0pt; font-family:"Times New Roman","serif";} a:link, span.MsoHyperlink {mso-style-priority:99; color:blue; text-decoration:underline;} a:visited, span.MsoHyperlinkFollowed {mso-style-priority:99; color:purple; text-decoration:underline;} span.EmailStyle17 {mso-style-type:personal-compose; font-family:"Century Gothic","sans-serif"; color:windowtext;} .MsoChpDefault {mso-style-type:export-only; font-family:"Calibri","sans-serif";} @page WordSection1 {size:8.5in 11.0in; margin:1.0in 1.0in 1.0in 1.0in;} div.WordSection1 {page:WordSection1;} --></style><!--[if gte mso 9]><xml> <o:shapedefaults v:ext="edit" spidmax="1026" /> </xml><![endif]--><!--[if gte mso 9]><xml> <o:shapelayout v:ext="edit"> <o:idmap v:ext="edit" data="1" /> </o:shapelayout></xml><![endif]--> <div class="WordSection1"> <p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif"">On a cluster I can configure Memory Optimization “for server loads” (150% overcommit) or “for desktop loads” (200% overcommit).<o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif"">This relates to memory page sharing right? If so what’s the downside of just setting it as high as possible?</span></p> </div> </blockquote> <br> This is how much more memory you will use to create VMs. Using 150%, a hypervisor with 10GB of RAM will run up to 15 x 1GB VMs or 10 x 1,5GB VMs and so on. If it happens all VMs using all memory in the same time, you have KSM working to deduplicate memory pages and, as a last resource, enough swap to avoid the oom killer.<br> <br> The best setting here depends on your workload. If you already know your VMs will use all memory they have, so the less the better. If you want a big number of VMs and they are not going to stress the memory that much, you can play with the values and find what fits better for you.<br> <br> <blockquote cite="mid:b04cf8b58a7a49189a5c21f1a05b1b84@CD1001-M21.corp.ads" type="cite"> <div class="WordSection1"> <p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif""><o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif""><o:p> </o:p></span></p> <p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif"">Thanks,<o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif"">Ryan</span><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif""><o:p></o:p></span></p> </div> <br> <fieldset class="mimeAttachmentHeader"></fieldset> <br> <pre wrap="">_______________________________________________ Users mailing list <a class="moz-txt-link-abbreviated" href="mailto:Users@ovirt.org">Users@ovirt.org</a> <a class="moz-txt-link-freetext" href="http://lists.ovirt.org/mailman/listinfo/users">http://lists.ovirt.org/mailman/listinfo/users</a> </pre> </blockquote> <br> </body> </html> --------------050303090808090506060702--
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Groten, Ryan