Yingyi Bu has uploaded a new patch set (#2). Change subject: Performance fix for BufferCache. The dpid of a page of file is calculated by fileid<<32 + pageid. But BufferCache.hash(long dpid) returns the hash value dpid%pageMap.length. In many cases, the asterix configuration results in power-of-2 pageMap.length (b ......................................................................
Performance fix for BufferCache. The dpid of a page of file is calculated by fileid<<32 + pageid. But BufferCache.hash(long dpid) returns the hash value dpid%pageMap.length. In many cases, the asterix configuration results in power-of-2 pageMap.length (buffer-cache-size/page-size), which makes fileid useless. That used to result in serious consequences: different partitions contend for the same cache bucket (which contains a link list of size #partitions) for most of the time and therefore the CPU couldn't be saturated. Change-Id: I4afc406d612e569e23f65afdedc469459235ce7d --- M hyracks/hyracks-storage-common/src/main/java/edu/uci/ics/hyracks/storage/common/buffercache/BufferCache.java 1 file changed, 2 insertions(+), 1 deletion(-) git pull ssh://asterix-gerrit.ics.uci.edu:29418/hyracks refs/changes/41/341/2 -- To view, visit https://asterix-gerrit.ics.uci.edu/341 To unsubscribe, visit https://asterix-gerrit.ics.uci.edu/settings Gerrit-MessageType: newpatchset Gerrit-Change-Id: I4afc406d612e569e23f65afdedc469459235ce7d Gerrit-PatchSet: 2 Gerrit-Project: hyracks Gerrit-Branch: master Gerrit-Owner: Yingyi Bu <[email protected]>
