verify if hyperthreading is activated on the workers

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The big machines in Magellan are like this:

15 Big Memory nodes: 64 Intel Xeon X7560 @ 2.2GHz, 1TB RAM

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http://cloud.mcs.anl.gov/styled-2/index.html

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seb@bigmem:~$ hostname bigmem

Intel® Xeon® Processor X7560 http://ark.intel.com/products/46499/Intel-Xeon-Processor-X7560-24M-Cache-2_26-GHz-6_40-GTs-Intel-QPI

X7560 has 8 cores, 16 threads

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numa nodes seen:

seb@bigmem:~$ cat /proc/buddyinfo Node 0, zone DMA 1 0 1 0 2 1 1 0 1 1 3 Node 0, zone DMA32 5 4 2 3 5 5 4 4 2 2 870 Node 0, zone Normal 44850 30672 1143837 5664334 1924443 268748 7624 48 5 8 1

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seb@bigmem:/sys/devices/system$ pwd /sys/devices/system seb@bigmem:/sys/devices/system$ cat memory/block_size_bytes 8000000

seb@bigmem:/sys/devices/system$ ls memory/|grep ^memory|wc -l 7960

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seb@bigmem:/sys/devices/system/cpu$ ls cpu0 cpu10 cpu12 cpu14 cpu16 cpu18 cpu2 cpu21 cpu23 cpu25 cpu27 cpu29 cpu30 cpu4 cpu6 cpu8 cpuidle modalias online power probe uevent cpu1 cpu11 cpu13 cpu15 cpu17 cpu19 cpu20 cpu22 cpu24 cpu26 cpu28 cpu3 cpu31 cpu5 cpu7 cpu9 kernel_max offline possible present release seb@bigmem:/sys/devices/system/cpu$ cat present 0-31 seb@bigmem:/sys/devices/system/cpu$ cat offline

seb@bigmem:/sys/devices/system/cpu$ cat online 0-31

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seb@bigmem:/sys/devices/system/cpu$ cat */topology/physical_package_id|sort -n 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

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According to http://cloud.mcs.anl.gov/styled-2/index.html

There are 15 Big Memory nodes: 64 Intel Xeon X7560 @ 2.2GHz, 1TB RAM

Inside the instance, I can see 32 logical cores.

One X7560 has 8 physical cores, 16 threads (hyperthreading).

So the 32 logical cores are either provided by 4 X7560 processors (4 sockets, hyperthreading disabled) or by 2 X7560 processors (2 sockets, hyperthreading enabled).

I think it is provided by 4 sockets, but I am not sure.

Is it the case ?

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4 sockets, no HT