<div dir="ltr"><br>+pcc for LTO caching and +inglorion for Windows specific issues.<div>Teresa</div><div><br><div class="gmail_quote"><div dir="ltr">On Fri, Jun 1, 2018 at 8:47 AM Owen Reynolds via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hi all,<div><br></div><div>After experimenting with thin-lto caching behaviour I found an issue with pruning when on Windows. </div><div><br></div><div>

<p style="margin:0px 0px 12px;padding:0px;border:0px;color:rgb(0,0,0);font-family:"Segoe UI","Segoe UI Emoji","Segoe UI Symbol",Lato,"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:13px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:left;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial">Thin-lto cache file atimes are used for expiration based pruning, and since Vista, access file times are not updated by Windows by default:<br style="margin-top:0px"><a href="https://blogs.technet.microsoft.com/filecab/2006/11/07/disabling-last-access-time-in-windows-vista-to-improve-ntfs-performance/" class="m_-6534666185032380659m_6683881804732374457m_6147863672427879768gmail-m_2002141619253296797gmail-remarkup-link" rel="noreferrer" style="text-decoration:none;color:rgb(19,108,178)" target="_blank">https://blogs.technet.microsoft.com/filecab/2006/11/07/disabling-last-access-time-in-windows-vista-to-improve-ntfs-performance/</a></p><p style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0);font-family:"Segoe UI","Segoe UI Emoji","Segoe UI Symbol",Lato,"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:13px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:left;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial">This means on Windows, cache files are currently being pruned from creation time. </p>

<br></div><div>I've made a patch for this so any feedback would be appreciated:</div><div><br></div><div>D47266</div><div><br></div><div>Thanks,</div><div><br></div><div>Owen</div></div>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="m_-6534666185032380659gmail_signature" data-smartmail="gmail_signature"><span style="font-family:Times;font-size:medium"><table cellspacing="0" cellpadding="0"><tbody><tr style="color:rgb(85,85,85);font-family:sans-serif;font-size:small"><td style="border-top-style:solid;border-top-color:rgb(213,15,37);border-top-width:2px">Teresa Johnson |</td><td style="border-top-style:solid;border-top-color:rgb(51,105,232);border-top-width:2px"> Software Engineer |</td><td style="border-top-style:solid;border-top-color:rgb(0,153,57);border-top-width:2px"> <a href="mailto:tejohnson@google.com" target="_blank">tejohnson@google.com</a> |</td><td style="border-top-style:solid;border-top-color:rgb(238,178,17);border-top-width:2px"> 408-460-2413</td></tr></tbody></table></span></div></div></div>