On 29/03/13 14:18, Carlos E. R. wrote:
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On Friday, 2013-03-29 at 13:20 +1100, Basil Chupin wrote:
Well, I used both "top" and the System Monitor>System Load simultaneously (each running in a different workspace) to see what was happening during the copy processes using mc to copy the 11.1GB file to ext4 and ntfs partitions.
Sorry to disappoint, but I could not see any core "maxing out" during copying. The load was being distributed across 5 or possibly 6 cores (with wither 3 or 2 being almost idle). With the data jumping around from core to core it was just a bit hard to keep up :-) , but I did see that the max any single core reached in both cases (ext4, ntfs) was 74% - with, as I said, either 3 or 2 cores doing almost nothing).
Curious.
So the load was distributed on the cores... interesting. That's more complicated to analyze. There may be other issues in play. I'm guessing memory moves, and thus, board and memory bandwidth, but dunno how it can be diagnosed. Alternatively, the task is jumping from core to core, but nevertheless it is not running paralellized. On average the load would be low, but the cpu where the job is running, peaks.
I found this in the wikipedia which does not bode well for the argument of FUSE versus in-kernel thinige: Performance Benchmarks show that the driver's performance via FUSE is comparable to that of other filesystems' drivers in-kernel,[6] provided that the CPU is powerful enough. On embedded or old systems, the high processor usage can severely limit performance.[7] Current versions often show 100% CPU utilization on dealing with big files on fragmented NTFS file systems.[8] http://en.wikipedia.org/wiki/Ntfs-3g This leads to the question whether will all the fiddling about with changing where the USB devices are now mounted (in places other then the normal /media) and other stuffing around with changed paths this has a detrimental effect on the way ntfs-3g is now handled in openSUSE. (BTW,in case someone brings up the issue of the performance being hampered because the ntfs partition(s) have not been defragmented, well before I redid the tests a short time ago I defragmented all ntfs formatted partitions. The results were almost identical to those of yesterday.) BC -- Using openSUSE 12.3 x86_64 KDE 4.10.1 & kernel 3.8.4-1 on a system with- AMD FX 8-core 3.6/4.2GHz processor 16GB PC14900/1866MHz Quad Channel Corsair "Vengeance" RAM Gigabyte AMD3+ m/board; Gigabyte nVidia GTX550Ti 1GB DDR5 GPU -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org