With the HP ProLiant G5 and newer (G6, G7, Gen8) servers (e.g. DL380, ML370, etc. – Anything after the Intel 5400-series CPU’s), it is possible to disable half of the cores available to the server. This is a BIOS switch labeled “Processor Core Disable” with options “All Processors Enabled” and “Disable One-Half of cores per … Read more
From the cpusets documentation: Calls to sched_setaffinity are filtered to just those CPUs allowed in that task’s cpuset. This implies that CPU affinity masks are intersected with the cpus in the cgroup that the process is a member of. E.g. If the affinity mask of a process includes cores {0, 1, 3} and the process … Read more
I suspect the processors are being presented as single core processors in separate sockets. Windows 7 ultimate supports up to 2 socket systems, so it will use 2 processors. I don’t know if you can configure KVM to present the processors as either a single quad core CPU or 2 dual core CPUs, which should … Read more
Should be very little difference in performance between two dual core CPUs and a single quad core CPU, if you are using current Intel Xeons. However, you might expect to see slightly better performance from the quad-core CPU if it is a “true” Quad core design, ala the new AMD Opterons or the new Xeon … Read more
Use ‘&’ after a command to background a process, and ‘wait’ to wait for them to finish. Use ‘()’ around the commands if you need to create a sub-shell. #!/bin/bash curl -s -o foo http://example.com/file1 && echo “done1” & curl -s -o bar http://example.com/file2 && echo “done2” & curl -s -o baz http://example.com/file3 && echo … Read more