Options -Su -c will vastly change speed for non-Admin user when using -r

Question

Options -Su -c will vastly change speed for non-Admin user when using -r

VirtualTim opened this issue 3 years ago · 4 comments

Sorry for the wired description, it's kind of a wired issue. Hopefully come command line examples will clear it up.

Non-Admin: diskspd.exe -Su -c2G temp12.dat: 1222 MiB/s

WARNING: Error adjusting token privileges for SeManageVolumePrivilege (error code: 1300)
WARNING: Could not set privileges for setting valid file size; will use a slower method of preparing the file

Command Line: diskspd.exe -Su -c2G temp12.dat

Input parameters:

        timespan:   1
        -------------
        duration: 10s
        warm up time: 5s
        cool down time: 0s
        random seed: 0
        path: 'temp12.dat'
                think time: 0ms
                burst size: 0
                software cache disabled
                using hardware write cache, writethrough off
                performing read test
                block size: 65536
                using sequential I/O (stride: 65536)
                number of outstanding I/O operations: 2
                thread stride size: 0
                threads per file: 1
                using I/O Completion Ports
                IO priority: normal

System information:

        computer name: tlander-pc
        start time: 2021/07/12 05:32:40 UTC

Results for timespan 1:
*******************************************************************************

actual test time:       10.01s
thread count:           1
proc count:             16

CPU |  Usage |  User  |  Kernel |  Idle
-------------------------------------------
   0|  38.75%|   3.91%|   34.84%|  61.25%
   1|   1.72%|   1.40%|    0.31%|  98.28%
   2|   7.03%|   4.69%|    2.34%|  92.97%
   3|   0.78%|   0.16%|    0.63%|  99.22%
   4|   3.13%|   2.66%|    0.47%|  96.88%
   5|   1.41%|   0.94%|    0.47%|  98.59%
   6|   5.00%|   4.06%|    0.94%|  95.00%
   7|   2.66%|   2.50%|    0.16%|  97.34%
   8|   2.81%|   2.19%|    0.63%|  97.19%
   9|   1.88%|   1.25%|    0.63%|  98.13%
  10|   2.81%|   2.66%|    0.16%|  97.19%
  11|   2.50%|   2.34%|    0.16%|  97.50%
  12|   0.78%|   0.31%|    0.47%|  99.22%
  13|   2.03%|   1.25%|    0.78%|  97.97%
  14|   1.41%|   0.16%|    1.25%|  98.59%
  15|   3.28%|   2.03%|    1.25%|  96.72%
-------------------------------------------
avg.|   4.87%|   2.03%|    2.84%|  95.13%

Total IO
thread |       bytes     |     I/Os     |    MiB/s   |  I/O per s |  file
------------------------------------------------------------------------------
     0 |     12832276480 |       195805 |    1222.34 |   19557.49 | temp12.dat (2048MiB)
------------------------------------------------------------------------------
total:       12832276480 |       195805 |    1222.34 |   19557.49

Read IO
thread |       bytes     |     I/Os     |    MiB/s   |  I/O per s |  file
------------------------------------------------------------------------------
     0 |     12832276480 |       195805 |    1222.34 |   19557.49 | temp12.dat (2048MiB)
------------------------------------------------------------------------------
total:       12832276480 |       195805 |    1222.34 |   19557.49

Write IO
thread |       bytes     |     I/Os     |    MiB/s   |  I/O per s |  file
------------------------------------------------------------------------------
     0 |               0 |            0 |       0.00 |       0.00 | temp12.dat (2048MiB)
------------------------------------------------------------------------------
total:                 0 |            0 |       0.00 |       0.00

Non-Admin: diskspd.exe -Su -r4b -c2G temp12.dat: 645 MiB/s

WARNING: Error adjusting token privileges for SeManageVolumePrivilege (error code: 1300)
WARNING: Could not set privileges for setting valid file size; will use a slower method of preparing the file

Command Line: diskspd.exe -Su -r4b -c2G temp12.dat

Input parameters:

        timespan:   1
        -------------
        duration: 10s
        warm up time: 5s
        cool down time: 0s
        random seed: 0
        path: 'temp12.dat'
                think time: 0ms
                burst size: 0
                software cache disabled
                using hardware write cache, writethrough off
                performing read test
                block size: 65536
                using random I/O (alignment: 262144)
                number of outstanding I/O operations: 2
                thread stride size: 0
                threads per file: 1
                using I/O Completion Ports
                IO priority: normal

System information:

        computer name: tlander-pc
        start time: 2021/07/12 05:31:57 UTC

Results for timespan 1:
*******************************************************************************

actual test time:       10.01s
thread count:           1
proc count:             16

CPU |  Usage |  User  |  Kernel |  Idle
-------------------------------------------
   0|  23.56%|   3.59%|   19.97%|  76.44%
   1|   1.87%|   1.40%|    0.47%|  98.13%
   2|   8.11%|   6.08%|    2.03%|  91.89%
   3|   0.62%|   0.47%|    0.16%|  99.38%
   4|   3.59%|   2.81%|    0.78%|  96.41%
   5|   2.03%|   1.40%|    0.62%|  97.97%
   6|   2.34%|   1.87%|    0.47%|  97.66%
   7|   2.65%|   2.02%|    0.62%|  97.35%
   8|   1.72%|   1.40%|    0.31%|  98.28%
   9|   3.12%|   2.81%|    0.31%|  96.88%
  10|   1.09%|   0.78%|    0.31%|  98.91%
  11|   4.52%|   4.37%|    0.16%|  95.48%
  12|   1.87%|   0.47%|    1.40%|  98.13%
  13|   1.56%|   0.47%|    1.09%|  98.44%
  14|   1.25%|   0.16%|    1.09%|  98.75%
  15|   2.50%|   1.09%|    1.40%|  97.50%
-------------------------------------------
avg.|   3.90%|   1.95%|    1.95%|  96.10%

Total IO
thread |       bytes     |     I/Os     |    MiB/s   |  I/O per s |  file
------------------------------------------------------------------------------
     0 |      6773342208 |       103353 |     645.24 |   10323.76 | temp12.dat (2048MiB)
------------------------------------------------------------------------------
total:        6773342208 |       103353 |     645.24 |   10323.76

Read IO
thread |       bytes     |     I/Os     |    MiB/s   |  I/O per s |  file
------------------------------------------------------------------------------
     0 |      6773342208 |       103353 |     645.24 |   10323.76 | temp12.dat (2048MiB)
------------------------------------------------------------------------------
total:        6773342208 |       103353 |     645.24 |   10323.76

Write IO
thread |       bytes     |     I/Os     |    MiB/s   |  I/O per s |  file
------------------------------------------------------------------------------
     0 |               0 |            0 |       0.00 |       0.00 | temp12.dat (2048MiB)
------------------------------------------------------------------------------
total:                 0 |            0 |       0.00 |       0.00

This behaviour does not occur with an Admin user. Both runs got ~1300 MiB/s.

Admin: diskspd.exe -Su -c2G temp22.dat: 1340 MiB/s

Command Line: diskspd.exe -Su -c2G temp22.dat

Input parameters:

        timespan:   1
        -------------
        duration: 10s
        warm up time: 5s
        cool down time: 0s
        random seed: 0
        path: 'temp22.dat'
                think time: 0ms
                burst size: 0
                software cache disabled
                using hardware write cache, writethrough off
                performing read test
                block size: 65536
                using sequential I/O (stride: 65536)
                number of outstanding I/O operations: 2
                thread stride size: 0
                threads per file: 1
                using I/O Completion Ports
                IO priority: normal

System information:

        computer name: tlander-pc
        start time: 2021/07/12 06:01:07 UTC

Results for timespan 1:
*******************************************************************************

actual test time:       10.00s
thread count:           1
proc count:             16

CPU |  Usage |  User  |  Kernel |  Idle
-------------------------------------------
   0|  45.78%|   3.91%|   41.88%|  54.22%
   1|   2.19%|   2.03%|    0.16%|  97.81%
   2|   6.09%|   3.13%|    2.97%|  93.91%
   3|   1.72%|   1.25%|    0.47%|  98.28%
   4|   2.03%|   1.88%|    0.16%|  97.97%
   5|   4.22%|   4.22%|    0.00%|  95.78%
   6|   1.25%|   1.09%|    0.16%|  98.75%
   7|   3.75%|   3.13%|    0.63%|  96.25%
   8|   1.56%|   1.09%|    0.47%|  98.44%
   9|   3.91%|   2.97%|    0.94%|  96.09%
  10|   2.97%|   2.19%|    0.78%|  97.03%
  11|   1.72%|   1.41%|    0.31%|  98.28%
  12|   2.03%|   0.94%|    1.09%|  97.97%
  13|   2.34%|   0.63%|    1.72%|  97.66%
  14|   1.88%|   1.56%|    0.31%|  98.13%
  15|   2.97%|   1.25%|    1.72%|  97.03%
-------------------------------------------
avg.|   5.40%|   2.04%|    3.36%|  94.60%

Total IO
thread |       bytes     |     I/Os     |    MiB/s   |  I/O per s |  file
------------------------------------------------------------------------------
     0 |     14060027904 |       214539 |    1340.54 |   21448.62 | temp22.dat (2048MiB)
------------------------------------------------------------------------------
total:       14060027904 |       214539 |    1340.54 |   21448.62

Read IO
thread |       bytes     |     I/Os     |    MiB/s   |  I/O per s |  file
------------------------------------------------------------------------------
     0 |     14060027904 |       214539 |    1340.54 |   21448.62 | temp22.dat (2048MiB)
------------------------------------------------------------------------------
total:       14060027904 |       214539 |    1340.54 |   21448.62

Write IO
thread |       bytes     |     I/Os     |    MiB/s   |  I/O per s |  file
------------------------------------------------------------------------------
     0 |               0 |            0 |       0.00 |       0.00 | temp22.dat (2048MiB)
------------------------------------------------------------------------------
total:                 0 |            0 |       0.00 |       0.00

Admin: diskspd.exe -Su -r4b -c2G temp22.dat: 1290 MiB/s

Command Line: diskspd.exe -Su -r4b -c2G temp22.dat

Input parameters:

        timespan:   1
        -------------
        duration: 10s
        warm up time: 5s
        cool down time: 0s
        random seed: 0
        path: 'temp22.dat'
                think time: 0ms
                burst size: 0
                software cache disabled
                using hardware write cache, writethrough off
                performing read test
                block size: 65536
                using random I/O (alignment: 262144)
                number of outstanding I/O operations: 2
                thread stride size: 0
                threads per file: 1
                using I/O Completion Ports
                IO priority: normal

System information:

        computer name: tlander-pc
        start time: 2021/07/12 06:01:39 UTC

Results for timespan 1:
*******************************************************************************

actual test time:       10.01s
thread count:           1
proc count:             16

CPU |  Usage |  User  |  Kernel |  Idle
-------------------------------------------
   0|  40.47%|   4.84%|   35.63%|  59.53%
   1|   1.56%|   0.63%|    0.94%|  98.44%
   2|   4.22%|   2.66%|    1.56%|  95.78%
   3|   2.03%|   2.03%|    0.00%|  97.97%
   4|   2.34%|   2.03%|    0.31%|  97.66%
   5|   6.09%|   5.47%|    0.63%|  93.91%
   6|   2.03%|   1.56%|    0.47%|  97.97%
   7|   4.06%|   3.44%|    0.63%|  95.94%
   8|   2.81%|   1.88%|    0.94%|  97.19%
   9|   3.28%|   2.81%|    0.47%|  96.72%
  10|   3.75%|   2.81%|    0.94%|  96.25%
  11|   1.72%|   1.41%|    0.31%|  98.28%
  12|   4.22%|   2.81%|    1.41%|  95.78%
  13|   2.34%|   0.31%|    2.03%|  97.66%
  14|   3.59%|   2.66%|    0.94%|  96.41%
  15|   5.31%|   2.97%|    2.34%|  94.69%
-------------------------------------------
avg.|   5.62%|   2.52%|    3.10%|  94.38%

Total IO
thread |       bytes     |     I/Os     |    MiB/s   |  I/O per s |  file
------------------------------------------------------------------------------
     0 |     13538885632 |       206587 |    1290.11 |   20641.78 | temp22.dat (2048MiB)
------------------------------------------------------------------------------
total:       13538885632 |       206587 |    1290.11 |   20641.78

Read IO
thread |       bytes     |     I/Os     |    MiB/s   |  I/O per s |  file
------------------------------------------------------------------------------
     0 |     13538885632 |       206587 |    1290.11 |   20641.78 | temp22.dat (2048MiB)
------------------------------------------------------------------------------
total:       13538885632 |       206587 |    1290.11 |   20641.78

Write IO
thread |       bytes     |     I/Os     |    MiB/s   |  I/O per s |  file
------------------------------------------------------------------------------
     0 |               0 |            0 |       0.00 |       0.00 | temp22.dat (2048MiB)
------------------------------------------------------------------------------
total:                 0 |            0 |       0.00 |       0.00

Answer 1 · 2021-07-12T17:57:23.000Z

This one is less obvious at first glance. However, I noticed that the slower of the non-admin runs ran before the fast one (opposite to how you’re showing them). Note the timestamps? Are the results consistent and independent of the order you run them in, do they reproduce if you simply re-run each case twice, and/or do they reproduce if you warm up for a longer period of time (say 60s)? Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10 From: Tim ***@***.***> Sent: Sunday, July 11, 2021 11:06 PM To: ***@***.***> Cc: ***@***.***> Subject: [microsoft/diskspd] Options -Su -c will vastly change speed for non-Admin user when using -r (#148) Sorry for the wired description, it's kind of a wired issue. Hopefully come command line examples will clear it up. Non-Admin: diskspd.exe -Su -c2G temp12.dat: 1222 MiB/s WARNING: Error adjusting token privileges for SeManageVolumePrivilege (error code: 1300) WARNING: Could not set privileges for setting valid file size; will use a slower method of preparing the file Command Line: diskspd.exe -Su -c2G temp12.dat Input parameters: timespan: 1

…

------------- duration: 10s warm up time: 5s cool down time: 0s random seed: 0 path: 'temp12.dat' think time: 0ms burst size: 0 software cache disabled using hardware write cache, writethrough off performing read test block size: 65536 using sequential I/O (stride: 65536) number of outstanding I/O operations: 2 thread stride size: 0 threads per file: 1 using I/O Completion Ports IO priority: normal System information: computer name: tlander-pc start time: 2021/07/12 05:32:40 UTC Results for timespan 1: ******************************************************************************* actual test time: 10.01s thread count: 1 proc count: 16 CPU | Usage | User | Kernel | Idle

------------------------------------------- 0| 38.75%| 3.91%| 34.84%| 61.25% 1| 1.72%| 1.40%| 0.31%| 98.28% 2| 7.03%| 4.69%| 2.34%| 92.97% 3| 0.78%| 0.16%| 0.63%| 99.22% 4| 3.13%| 2.66%| 0.47%| 96.88% 5| 1.41%| 0.94%| 0.47%| 98.59% 6| 5.00%| 4.06%| 0.94%| 95.00% 7| 2.66%| 2.50%| 0.16%| 97.34% 8| 2.81%| 2.19%| 0.63%| 97.19% 9| 1.88%| 1.25%| 0.63%| 98.13% 10| 2.81%| 2.66%| 0.16%| 97.19% 11| 2.50%| 2.34%| 0.16%| 97.50% 12| 0.78%| 0.31%| 0.47%| 99.22% 13| 2.03%| 1.25%| 0.78%| 97.97% 14| 1.41%| 0.16%| 1.25%| 98.59% 15| 3.28%| 2.03%| 1.25%| 96.72%

------------------------------------------- avg.| 4.87%| 2.03%| 2.84%| 95.13% Total IO thread | bytes | I/Os | MiB/s | I/O per s | file

------------------------------------------------------------------------------ 0 | 12832276480 | 195805 | 1222.34 | 19557.49 | temp12.dat (2048MiB)

------------------------------------------------------------------------------ 0 | 12832276480 | 195805 | 1222.34 | 19557.49 | temp12.dat (2048MiB)

------------------------------------------------------------------------------ 0 | 0 | 0 | 0.00 | 0.00 | temp12.dat (2048MiB)

------------------------------------------------------------------------------ total: 0 | 0 | 0.00 | 0.00 Non-Admin: diskspd.exe -Su -r4b -c2G temp12.dat: 645 MiB/s WARNING: Error adjusting token privileges for SeManageVolumePrivilege (error code: 1300) WARNING: Could not set privileges for setting valid file size; will use a slower method of preparing the file Command Line: diskspd.exe -Su -r4b -c2G temp12.dat Input parameters: timespan: 1

------------- duration: 10s warm up time: 5s cool down time: 0s random seed: 0 path: 'temp12.dat' think time: 0ms burst size: 0 software cache disabled using hardware write cache, writethrough off performing read test block size: 65536 using random I/O (alignment: 262144) number of outstanding I/O operations: 2 thread stride size: 0 threads per file: 1 using I/O Completion Ports IO priority: normal System information: computer name: tlander-pc start time: 2021/07/12 05:31:57 UTC Results for timespan 1: ******************************************************************************* actual test time: 10.01s thread count: 1 proc count: 16 CPU | Usage | User | Kernel | Idle

------------------------------------------- 0| 23.56%| 3.59%| 19.97%| 76.44% 1| 1.87%| 1.40%| 0.47%| 98.13% 2| 8.11%| 6.08%| 2.03%| 91.89% 3| 0.62%| 0.47%| 0.16%| 99.38% 4| 3.59%| 2.81%| 0.78%| 96.41% 5| 2.03%| 1.40%| 0.62%| 97.97% 6| 2.34%| 1.87%| 0.47%| 97.66% 7| 2.65%| 2.02%| 0.62%| 97.35% 8| 1.72%| 1.40%| 0.31%| 98.28% 9| 3.12%| 2.81%| 0.31%| 96.88% 10| 1.09%| 0.78%| 0.31%| 98.91% 11| 4.52%| 4.37%| 0.16%| 95.48% 12| 1.87%| 0.47%| 1.40%| 98.13% 13| 1.56%| 0.47%| 1.09%| 98.44% 14| 1.25%| 0.16%| 1.09%| 98.75% 15| 2.50%| 1.09%| 1.40%| 97.50%

------------------------------------------- avg.| 3.90%| 1.95%| 1.95%| 96.10% Total IO thread | bytes | I/Os | MiB/s | I/O per s | file

------------------------------------------------------------------------------ 0 | 6773342208 | 103353 | 645.24 | 10323.76 | temp12.dat (2048MiB)

------------------------------------------------------------------------------ 0 | 6773342208 | 103353 | 645.24 | 10323.76 | temp12.dat (2048MiB)

------------------------------------------------------------------------------ 0 | 0 | 0 | 0.00 | 0.00 | temp12.dat (2048MiB)

------------------------------------------------------------------------------ total: 0 | 0 | 0.00 | 0.00 This behaviour does not occur with an Admin user. Both runs got ~1300 MiB/s. Admin: diskspd.exe -Su -c2G temp12.dat: 1340 MiB/s Command Line: diskspd.exe -Su -c2G temp22.dat Input parameters: timespan: 1

------------- duration: 10s warm up time: 5s cool down time: 0s random seed: 0 path: 'temp22.dat' think time: 0ms burst size: 0 software cache disabled using hardware write cache, writethrough off performing read test block size: 65536 using sequential I/O (stride: 65536) number of outstanding I/O operations: 2 thread stride size: 0 threads per file: 1 using I/O Completion Ports IO priority: normal System information: computer name: tlander-pc start time: 2021/07/12 06:01:07 UTC Results for timespan 1: ******************************************************************************* actual test time: 10.00s thread count: 1 proc count: 16 CPU | Usage | User | Kernel | Idle

------------------------------------------- 0| 45.78%| 3.91%| 41.88%| 54.22% 1| 2.19%| 2.03%| 0.16%| 97.81% 2| 6.09%| 3.13%| 2.97%| 93.91% 3| 1.72%| 1.25%| 0.47%| 98.28% 4| 2.03%| 1.88%| 0.16%| 97.97% 5| 4.22%| 4.22%| 0.00%| 95.78% 6| 1.25%| 1.09%| 0.16%| 98.75% 7| 3.75%| 3.13%| 0.63%| 96.25% 8| 1.56%| 1.09%| 0.47%| 98.44% 9| 3.91%| 2.97%| 0.94%| 96.09% 10| 2.97%| 2.19%| 0.78%| 97.03% 11| 1.72%| 1.41%| 0.31%| 98.28% 12| 2.03%| 0.94%| 1.09%| 97.97% 13| 2.34%| 0.63%| 1.72%| 97.66% 14| 1.88%| 1.56%| 0.31%| 98.13% 15| 2.97%| 1.25%| 1.72%| 97.03%

------------------------------------------- avg.| 5.40%| 2.04%| 3.36%| 94.60% Total IO thread | bytes | I/Os | MiB/s | I/O per s | file

------------------------------------------------------------------------------ 0 | 14060027904 | 214539 | 1340.54 | 21448.62 | temp22.dat (2048MiB)

------------------------------------------------------------------------------ 0 | 14060027904 | 214539 | 1340.54 | 21448.62 | temp22.dat (2048MiB)

------------------------------------------------------------------------------ 0 | 0 | 0 | 0.00 | 0.00 | temp22.dat (2048MiB)

------------------------------------------------------------------------------ total: 0 | 0 | 0.00 | 0.00 Admin: diskspd.exe -Su -r4b -c2G temp12.dat: 1290 MiB/s Command Line: diskspd.exe -Su -r4b -c2G temp22.dat Input parameters: timespan: 1

------------- duration: 10s warm up time: 5s cool down time: 0s random seed: 0 path: 'temp22.dat' think time: 0ms burst size: 0 software cache disabled using hardware write cache, writethrough off performing read test block size: 65536 using random I/O (alignment: 262144) number of outstanding I/O operations: 2 thread stride size: 0 threads per file: 1 using I/O Completion Ports IO priority: normal System information: computer name: tlander-pc start time: 2021/07/12 06:01:39 UTC Results for timespan 1: ******************************************************************************* actual test time: 10.01s thread count: 1 proc count: 16 CPU | Usage | User | Kernel | Idle

------------------------------------------- 0| 40.47%| 4.84%| 35.63%| 59.53% 1| 1.56%| 0.63%| 0.94%| 98.44% 2| 4.22%| 2.66%| 1.56%| 95.78% 3| 2.03%| 2.03%| 0.00%| 97.97% 4| 2.34%| 2.03%| 0.31%| 97.66% 5| 6.09%| 5.47%| 0.63%| 93.91% 6| 2.03%| 1.56%| 0.47%| 97.97% 7| 4.06%| 3.44%| 0.63%| 95.94% 8| 2.81%| 1.88%| 0.94%| 97.19% 9| 3.28%| 2.81%| 0.47%| 96.72% 10| 3.75%| 2.81%| 0.94%| 96.25% 11| 1.72%| 1.41%| 0.31%| 98.28% 12| 4.22%| 2.81%| 1.41%| 95.78% 13| 2.34%| 0.31%| 2.03%| 97.66% 14| 3.59%| 2.66%| 0.94%| 96.41% 15| 5.31%| 2.97%| 2.34%| 94.69%

------------------------------------------- avg.| 5.62%| 2.52%| 3.10%| 94.38% Total IO thread | bytes | I/Os | MiB/s | I/O per s | file

------------------------------------------------------------------------------ 0 | 13538885632 | 206587 | 1290.11 | 20641.78 | temp22.dat (2048MiB)

------------------------------------------------------------------------------ 0 | 13538885632 | 206587 | 1290.11 | 20641.78 | temp22.dat (2048MiB)

------------------------------------------------------------------------------ 0 | 0 | 0 | 0.00 | 0.00 | temp22.dat (2048MiB)

------------------------------------------------------------------------------ total: 0 | 0 | 0.00 | 0.00 — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fmicrosoft%2Fdiskspd%2Fissues%2F148&data=04%7C01%7C%7C2ae6dc065f814fdd747308d944fb2aab%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637616667806972657%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=Xfdza86ZQesJkpFzhPb60RLRWm3EnlcGUuev%2Fpl5A5o%3D&reserved=0>, or unsubscribe<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fnotifications%2Funsubscribe-auth%2FACCWSKKLRQSU5ANMFNOQPQTTXKA5VANCNFSM5AGEPMCQ&data=04%7C01%7C%7C2ae6dc065f814fdd747308d944fb2aab%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637616667806972657%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=9BEmnpLwHonvxJlVetuptvfWozHLuY2g75Rak7ak95c%3D&reserved=0>.

Answer 2 · 2021-07-15T06:12:35.000Z

diskspd.exe -Su -r4b -c2G temp13.dat run 4 times in a row:

596.53 MiB/s
625.00 MiB/s
631.94 MiB/s
504.62 MiB/s

diskspd.exe -Su -c2G temp14.dat run 4 times in a row (after the above, but also using a different file):

996.80 MiB/s
1304.05 MiB/s
984.27 MiB/s
1340.03 MiB/s

diskspd.exe -Su -r4b -c2G temp13.dat run once again (after the above)

587.89 MiB/s

Answer 3 · 2021-07-15T14:37:14.000Z

Is this being run on a multi-socket system?

Answer 4 · 2021-07-16T03:48:33.000Z

No, single processor, an i7-10700.