On 1/14/20 1:15 PM, Wenhui Zhang wrote:
On Tue, Jan 14, 2020 at 4:08 PM Casey Schaufler <casey@xxxxxxxxxxxxxxxx <mailto:casey@xxxxxxxxxxxxxxxx>> wrote:
On 1/14/2020 12:15 PM, Wenhui Zhang wrote:
> Hi, Casey:
>
> I just performed a performance check on
> 1. v5.3 with DAC only, and
> 2. v5.3 with DAC and MAC framework, an empty-policy enabled in sub-modules(e.g. selinux)
> It seems like the downgrade is quite obvious. (here the perf is described in range 0 - 1, 0 is 0% and 1 is 100%).
> I am using a typical laptop for test, 4 2750MHz CPU, with SSD and 8G memory.
> Hope this might raise the performance issue.
Thank you for doing this. Unfortunately, your graph is unreadable.
Could you provide some more detail about your results?
Sure. In summary, most of the benchmarks has more than 20% of performance downgrade, some even have 80% performance downgrade.
I am attaching some details as following.
Nice to see some testing, it is much needed and appreciated.
this doesn't really measure the MAC framework overhead but MAC
framework + selinux + unknown. Even without policy each LSM will
have its own overhead that should be measured separately from the
overhead of the LSM infrastructure. The "unknown" component above
is that we don't have your configs so we can't see what other LSM
modules might be enabled.
to make a proper comparison of the infrastructure compare DAC
(no CONFIG_SECURITY)
to LSM + only the capabilities module
security=capability
or
lsm=capability
or clearing the ordered lsm list in the config.
which is the equivalent of just DAC with the LSM infrastructure.
Further measurements can then be made against each LSM component.
Eg. if you have integrity and ima they will each introduce some
overhead of their own.
without MAC FS perf:
stat
Creating benchmark environment...done.
default
Simple stat median=0.7133 [mean=0.7254 +/-0.0057] microseconds
var: 0.002553 sd: 0.050524 runs: 300
Simple stat median=0.7159 [mean=0.7258 +/-0.0038] microseconds
var: 0.001152 sd: 0.033934 runs: 300
FFF
Simple stat median=0.5378 [mean=0.5496 +/-0.0065] microseconds
var: 0.003344 sd: 0.057826 runs: 300
Simple stat median=0.5384 [mean=0.5442 +/-0.0018] microseconds
var: 0.000246 sd: 0.015683 runs: 300
XXX/FFF
Simple stat median=0.5798 [mean=0.5893 +/-0.0038] microseconds
var: 0.001124 sd: 0.033528 runs: 300
Simple stat median=0.5796 [mean=0.6125 +/-0.0130] microseconds
var: 0.013272 sd: 0.115206 runs: 300
XXX/YYY/ZZZ/FFF
Simple stat median=0.6556 [mean=0.6762 +/-0.0108] microseconds
var: 0.009025 sd: 0.095001 runs: 300
Simple stat median=0.6572 [mean=0.6641 +/-0.0021] microseconds
var: 0.000340 sd: 0.018430 runs: 300
XXX/YYY/ZZZ/AAA/BBB/CCC/DDD/FFF
Simple stat median=0.8264 [mean=0.8377 +/-0.0037] microseconds
var: 0.001052 sd: 0.032440 runs: 300
Simple stat median=0.8262 [mean=0.8447 +/-0.0096] microseconds
var: 0.007220 sd: 0.084971 runs: 300
XXX/YYY/ZZZ/LLL
Simple stat median=0.7934 [mean=0.8129 +/-0.0117] microseconds
var: 0.010681 sd: 0.103351 runs: 300
Simple stat median=0.7882 [mean=0.7957 +/-0.0021] microseconds
var: 0.000329 sd: 0.018143 runs: 300
LLL/YYY/ZZZ/FFF
Simple stat median=0.7230 [mean=0.7317 +/-0.0041] microseconds
var: 0.001298 sd: 0.036026 runs: 300
Simple stat median=0.7212 [mean=0.7291 +/-0.0021] microseconds
var: 0.000349 sd: 0.018693 runs: 300
XXX/YYY/ZZZ/NNN
Simple stat median=0.5068 [mean=0.5119 +/-0.0024] microseconds
var: 0.000456 sd: 0.021350 runs: 300
Simple stat median=0.5059 [mean=0.5106 +/-0.0017] microseconds
var: 0.000227 sd: 0.015053 runs: 300
NNN/YYY/ZZZ/FFF
Simple stat median=0.3928 [mean=0.3970 +/-0.0017] microseconds
var: 0.000236 sd: 0.015357 runs: 300
Simple stat median=0.3928 [mean=0.3961 +/-0.0017] microseconds
var: 0.000218 sd: 0.014781 runs: 300
XXX/../FFF
Simple stat median=0.6139 [mean=0.6259 +/-0.0076] microseconds
var: 0.004464 sd: 0.066816 runs: 300
Simple stat median=0.6171 [mean=0.6237 +/-0.0037] microseconds
var: 0.001051 sd: 0.032415 runs: 300
XXX/YYY/../../AAA/BBB/../../FFF
Simple stat median=0.8165 [mean=0.8279 +/-0.0067] microseconds
var: 0.003469 sd: 0.058901 runs: 300
Simple stat median=0.8167 [mean=0.8225 +/-0.0023] microseconds
var: 0.000428 sd: 0.020688 runs: 300
open
Creating benchmark environment...default
Simple open/close median=1.4779 [mean=1.5905 +/-0.0385] microseconds
var: 0.116006 sd: 0.340596 runs: 300
Simple open/close median=1.4086 [mean=1.6213 +/-0.0497] microseconds
var: 0.192852 sd: 0.439150 runs: 300
FFF
Simple open/close median=1.3212 [mean=1.4896 +/-0.0526] microseconds
var: 0.215954 sd: 0.464709 runs: 300
Simple open/close median=1.2311 [mean=1.5243 +/-0.0699] microseconds
var: 0.381443 sd: 0.617610 runs: 300
XXX/FFF
Simple open/close median=1.2690 [mean=1.5006 +/-0.0577] microseconds
var: 0.260051 sd: 0.509952 runs: 300
Simple open/close median=1.2713 [mean=1.4765 +/-0.0502] microseconds
var: 0.196706 sd: 0.443516 runs: 300
XXX/YYY/ZZZ/FFF
Simple open/close median=1.3574 [mean=1.5633 +/-0.0476] microseconds
var: 0.177268 sd: 0.421033 runs: 300
Simple open/close median=1.3325 [mean=1.5841 +/-0.0500] microseconds
var: 0.195362 sd: 0.441998 runs: 300
XXX/YYY/ZZZ/AAA/BBB/CCC/DDD/FFF
Simple open/close median=1.4976 [mean=1.7416 +/-0.0628] microseconds
var: 0.307634 sd: 0.554648 runs: 300
Simple open/close median=1.5089 [mean=1.7448 +/-0.0611] microseconds
var: 0.291463 sd: 0.539873 runs: 300
XXX/YYY/ZZZ/LLL
Simple open/close median=1.4776 [mean=1.7033 +/-0.0554] microseconds
var: 0.239411 sd: 0.489297 runs: 300
Simple open/close median=1.4884 [mean=1.7037 +/-0.0652] microseconds
var: 0.331621 sd: 0.575866 runs: 300
LLL/YYY/ZZZ/FFF
Simple open/close median=1.4718 [mean=1.5590 +/-0.0401] microseconds
var: 0.125453 sd: 0.354193 runs: 300
Simple open/close median=1.4658 [mean=1.5995 +/-0.0389] microseconds
var: 0.118034 sd: 0.343561 runs: 300
XXX/YYY/ZZZ/NNN
Simple open/close median=0.8414 [mean=1.1660 +/-0.0772] microseconds
var: 0.465053 sd: 0.681948 runs: 300
Simple open/close median=0.8202 [mean=1.1470 +/-0.0713] microseconds
var: 0.396935 sd: 0.630027 runs: 300
NNN/YYY/ZZZ/FFF
Simple open/close median=0.7096 [mean=1.0043 +/-0.0818] microseconds
var: 0.522749 sd: 0.723014 runs: 300
Simple open/close median=0.7075 [mean=1.0112 +/-0.0670] microseconds
var: 0.351028 sd: 0.592476 runs: 300
XXX/../FFF
Simple open/close median=1.3065 [mean=1.5606 +/-0.0610] microseconds
var: 0.290301 sd: 0.538796 runs: 300
Simple open/close median=1.3355 [mean=1.6094 +/-0.0722] microseconds
var: 0.406936 sd: 0.637915 runs: 300
XXX/YYY/../../AAA/BBB/../../FFF
Simple open/close median=1.4716 [mean=1.7323 +/-0.0649] microseconds
var: 0.329295 sd: 0.573843 runs: 300
Simple open/close median=1.5467 [mean=1.8504 +/-0.0767] microseconds
var: 0.459608 sd: 0.677944 runs: 300
chmod
DIR0
Simple chmod median=1.1741 [mean=1.1911 +/-0.0048] microseconds
var: 0.001773 sd: 0.042103 runs: 300
Simple chmod median=1.1699 [mean=1.1840 +/-0.0046] microseconds
var: 0.001680 sd: 0.040990 runs: 300
DIR10
Simple chmod median=1.2598 [mean=1.2770 +/-0.0090] microseconds
var: 0.006326 sd: 0.079539 runs: 300
Simple chmod median=1.1693 [mean=1.1820 +/-0.0039] microseconds
var: 0.001164 sd: 0.034113 runs: 300
DIR100
Simple chmod median=1.1676 [mean=1.1831 +/-0.0069] microseconds
var: 0.003680 sd: 0.060666 runs: 300
Simple chmod median=1.1696 [mean=1.2417 +/-0.0288] microseconds
var: 0.064871 sd: 0.254698 runs: 300
DIR1000
Simple chmod median=1.1823 [mean=1.1946 +/-0.0035] microseconds
var: 0.000972 sd: 0.031174 runs: 300
Simple chmod median=1.1801 [mean=1.1939 +/-0.0040] microseconds
var: 0.001277 sd: 0.035735 runs: 300
DIR10000
Simple chmod median=1.1893 [mean=1.2031 +/-0.0054] microseconds
var: 0.002237 sd: 0.047294 runs: 300
Simple chmod median=1.1824 [mean=1.1966 +/-0.0046] microseconds
var: 0.001654 sd: 0.040671 runs: 300
rename
DIR0
Simple rename median=3.9288 [mean=4.1751 +/-0.0999] microseconds
var: 0.779841 sd: 0.883086 runs: 300
Simple rename median=3.9200 [mean=4.1499 +/-0.0917] microseconds
var: 0.656825 sd: 0.810447 runs: 300
DIR10
Simple rename median=4.5611 [mean=4.8041 +/-0.0992] microseconds
var: 0.768976 sd: 0.876913 runs: 300
Simple rename median=4.5597 [mean=4.7682 +/-0.0695] microseconds
var: 0.377366 sd: 0.614301 runs: 300
DIR100
Simple rename median=4.6055 [mean=4.7385 +/-0.0687] microseconds
var: 0.368270 sd: 0.606853 runs: 300
Simple rename median=4.6258 [mean=4.7810 +/-0.0807] microseconds
var: 0.509114 sd: 0.713523 runs: 300
DIR1000
Simple rename median=4.5710 [mean=4.8293 +/-0.0921] microseconds
var: 0.662712 sd: 0.814071 runs: 300
Simple rename median=4.6070 [mean=4.8313 +/-0.0874] microseconds
var: 0.597162 sd: 0.772762 runs: 300
DIR10000
Simple rename median=4.6285 [mean=4.7643 +/-0.0717] microseconds
var: 0.401634 sd: 0.633746 runs: 300
Simple rename median=4.5886 [mean=4.8419 +/-0.0946] microseconds
var: 0.698920 sd: 0.836014 runs: 300
LMBench mkstemp benchmark...
FILE0,
Simple mkstemp median=10.7036 [mean=11.4172 +/-0.2403] microseconds
var: 4.508005 sd: 2.123206 runs: 300
Simple mkstemp median=10.7332 [mean=11.6058 +/-0.2749] microseconds
var: 5.900492 sd: 2.429093 runs: 300
FILE10,
Simple mkstemp median=10.9459 [mean=11.6833 +/-0.2566] microseconds
var: 5.140533 sd: 2.267274 runs: 300
Simple mkstemp median=11.3235 [mean=11.4085 +/-0.0802] microseconds
var: 0.502234 sd: 0.708685 runs: 300
FILE100,
Simple mkstemp median=12.7990 [mean=13.5488 +/-0.2515] microseconds
var: 4.939811 sd: 2.222569 runs: 300
Simple mkstemp median=12.7536 [mean=13.5472 +/-0.2460] microseconds
var: 4.725637 sd: 2.173853 runs: 300
FILE1000,
Simple mkstemp median=16.3758 [mean=17.2494 +/-0.3032] microseconds
var: 7.180255 sd: 2.679600 runs: 300
Simple mkstemp median=16.4186 [mean=16.6040 +/-0.1322] microseconds
var: 1.365365 sd: 1.168488 runs: 300
FILE10000,
Simple mkstemp median=16.9423 [mean=17.7549 +/-0.2862] microseconds
var: 6.394964 sd: 2.528827 runs: 300
Simple mkstemp median=17.2046 [mean=17.4739 +/-0.1404] microseconds
var: 1.538521 sd: 1.240371 runs: 300
LMBench readdir benchmark...
FILE0,
Simple readdir median=3.2470 [mean=3.4157 +/-0.0748] microseconds
var: 0.437047 sd: 0.661095 runs: 300
Simple readdir median=3.2251 [mean=3.4753 +/-0.0918] microseconds
var: 0.658597 sd: 0.811540 runs: 300
FILE10,
Simple readdir median=6.0984 [mean=6.1701 +/-0.0368] microseconds
var: 0.105670 sd: 0.325069 runs: 300
Simple readdir median=6.1509 [mean=6.2974 +/-0.0764] microseconds
var: 0.456050 sd: 0.675315 runs: 300
FILE100,
Simple readdir median=34.3000 [mean=34.6490 +/-0.1500] microseconds
var: 1.755986 sd: 1.325136 runs: 300
Simple readdir median=33.2237 [mean=33.6693 +/-0.1680] microseconds
var: 2.203202 sd: 1.484319 runs: 300
FILE1000,
Simple readdir median=355.0667 [mean=357.5527 +/-0.9898] microseconds
var: 76.511562 sd: 8.747089 runs: 300
Simple readdir median=358.6667 [mean=362.1251 +/-0.9766] microseconds
var: 74.479095 sd: 8.630127 runs: 300
FILE10000,
Simple readdir median=3575.5000 [mean=3609.3333 +/-10.8026] microseconds
var: 9113.105909 sd: 95.462589 runs: 300
Simple readdir median=3576.0000 [mean=3610.7967 +/-9.8897] microseconds
var: 7637.921728 sd: 87.395204 runs: 300
rename-creat
Creating benchmark environment...done.
Simple rename-create median=12.0409 [mean=13.2621 +/-0.4418] microseconds
var: 15.242249 sd: 3.904132 runs: 300
Simple rename-create median=12.2638 [mean=12.6817 +/-0.2750] microseconds
var: 5.906039 sd: 2.430234 runs: 300
open-unlink
Creating benchmark environment...done.
Simple open-unlink median=10.1657 [mean=11.2717 +/-0.5313] microseconds
var: 22.041715 sd: 4.694860 runs: 300
Simple open-unlink median=10.1726 [mean=11.2655 +/-0.3946] microseconds
var: 12.156986 sd: 3.486687 runs: 300
Running lm_symlink-unlink as part of whole set.
symlink
Creating benchmark environment...done.
Simple symlink-unlink median=8.6493 [mean=8.7250 +/-0.0511] microseconds
var: 0.204218 sd: 0.451905 runs: 300
Simple symlink-unlink median=8.6155 [mean=9.0742 +/-0.1571] microseconds
var: 1.928171 sd: 1.388586 runs: 300
fstatat
Creating benchmark environment...done.
fstatat /test/FFF
Simple fstatat median=0.5885 [mean=0.5955 +/-0.0043] microseconds
var: 0.001426 sd: 0.037759 runs: 300
Simple fstatat median=0.5861 [mean=0.5912 +/-0.0013] microseconds
var: 0.000139 sd: 0.011810 runs: 300
openat
Creating benchmark environment...done.
openat /test/FFF
Simple openat/close median=1.2482 [mean=1.4966 +/-0.0583] microseconds
var: 0.265530 sd: 0.515296 runs: 300
Simple openat/close median=1.2745 [mean=1.5138 +/-0.0558] microseconds
var: 0.243167 sd: 0.493120 runs: 300
with MAC perf:
stat
Creating benchmark environment...done.
default
Simple stat median=1.0480 [mean=1.0491 +/-0.0004] microseconds
var: 0.000012 sd: 0.003456 runs: 300
Simple stat median=1.0464 [mean=1.0535 +/-0.0062] microseconds
var: 0.003004 sd: 0.054809 runs: 300
FFF
Simple stat median=0.8577 [mean=0.8588 +/-0.0004] microseconds
var: 0.000016 sd: 0.003959 runs: 300
Simple stat median=0.8574 [mean=0.8583 +/-0.0005] microseconds
var: 0.000018 sd: 0.004232 runs: 300
XXX/FFF
Simple stat median=0.9006 [mean=0.9011 +/-0.0004] microseconds
var: 0.000014 sd: 0.003807 runs: 300
Simple stat median=0.9007 [mean=0.9012 +/-0.0002] microseconds
var: 0.000003 sd: 0.001859 runs: 300
XXX/YYY/ZZZ/FFF
Simple stat median=0.9811 [mean=0.9824 +/-0.0005] microseconds
var: 0.000020 sd: 0.004496 runs: 300
Simple stat median=0.9813 [mean=0.9821 +/-0.0004] microseconds
var: 0.000011 sd: 0.003269 runs: 300
XXX/YYY/ZZZ/AAA/BBB/CCC/DDD/FFF
Simple stat median=1.1593 [mean=1.1604 +/-0.0004] microseconds
var: 0.000013 sd: 0.003634 runs: 300
Simple stat median=1.1562 [mean=1.1578 +/-0.0006] microseconds
var: 0.000027 sd: 0.005194 runs: 300
XXX/YYY/ZZZ/LLL
Simple stat median=1.1247 [mean=1.1260 +/-0.0006] microseconds
var: 0.000024 sd: 0.004876 runs: 300
Simple stat median=1.1221 [mean=1.1234 +/-0.0004] microseconds
var: 0.000014 sd: 0.003802 runs: 300
LLL/YYY/ZZZ/FFF
Simple stat median=1.0496 [mean=1.0508 +/-0.0005] microseconds
var: 0.000017 sd: 0.004162 runs: 300
Simple stat median=1.0501 [mean=1.0528 +/-0.0006] microseconds
var: 0.000028 sd: 0.005285 runs: 300
XXX/YYY/ZZZ/NNN
Simple stat median=0.8228 [mean=0.8237 +/-0.0004] microseconds
var: 0.000015 sd: 0.003844 runs: 300
Simple stat median=0.8207 [mean=0.8216 +/-0.0004] microseconds
var: 0.000014 sd: 0.003686 runs: 300
NNN/YYY/ZZZ/FFF
Simple stat median=0.7080 [mean=0.7083 +/-0.0003] microseconds
var: 0.000006 sd: 0.002355 runs: 300
Simple stat median=0.7106 [mean=0.7108 +/-0.0002] microseconds
var: 0.000003 sd: 0.001608 runs: 300
XXX/../FFF
Simple stat median=0.9376 [mean=0.9391 +/-0.0005] microseconds
var: 0.000017 sd: 0.004171 runs: 300
Simple stat median=0.9388 [mean=0.9396 +/-0.0004] microseconds
var: 0.000011 sd: 0.003335 runs: 300
XXX/YYY/../../AAA/BBB/../../FFF
Simple stat median=1.1465 [mean=1.1470 +/-0.0003] microseconds
var: 0.000006 sd: 0.002415 runs: 300
Simple stat median=1.1414 [mean=1.1484 +/-0.0074] microseconds
var: 0.004312 sd: 0.065662 runs: 300
open
Creating benchmark environment...default
Simple open/close median=2.0144 [mean=2.1228 +/-0.0356] microseconds
var: 0.098701 sd: 0.314167 runs: 300
Simple open/close median=2.0121 [mean=2.1171 +/-0.0290] microseconds
var: 0.065570 sd: 0.256066 runs: 300
FFF
Simple open/close median=1.8145 [mean=1.9360 +/-0.0346] microseconds
var: 0.093339 sd: 0.305515 runs: 300
Simple open/close median=1.8091 [mean=1.9537 +/-0.0351] microseconds
var: 0.096164 sd: 0.310103 runs: 300
XXX/FFF
Simple open/close median=1.8510 [mean=1.9833 +/-0.0377] microseconds
var: 0.110944 sd: 0.333083 runs: 300
Simple open/close median=1.8584 [mean=1.9888 +/-0.0324] microseconds
var: 0.082185 sd: 0.286679 runs: 300
XXX/YYY/ZZZ/FFF
Simple open/close median=1.9393 [mean=2.0653 +/-0.0378] microseconds
var: 0.111844 sd: 0.334430 runs: 300
Simple open/close median=1.9261 [mean=2.0403 +/-0.0289] microseconds
var: 0.065310 sd: 0.255559 runs: 300
XXX/YYY/ZZZ/AAA/BBB/CCC/DDD/FFF
Simple open/close median=2.1273 [mean=2.2631 +/-0.0407] microseconds
var: 0.129379 sd: 0.359692 runs: 300
Simple open/close median=2.1257 [mean=2.2406 +/-0.0343] microseconds
var: 0.091647 sd: 0.302733 runs: 300
XXX/YYY/ZZZ/LLL
Simple open/close median=2.1023 [mean=2.2059 +/-0.0310] microseconds
var: 0.074962 sd: 0.273791 runs: 300
Simple open/close median=2.0772 [mean=2.1913 +/-0.0342] microseconds
var: 0.091148 sd: 0.301907 runs: 300
LLL/YYY/ZZZ/FFF
Simple open/close median=2.0171 [mean=2.1292 +/-0.0307] microseconds
var: 0.073511 sd: 0.271129 runs: 300
Simple open/close median=2.0214 [mean=2.1321 +/-0.0347] microseconds
var: 0.094190 sd: 0.306904 runs: 300
XXX/YYY/ZZZ/NNN
Simple open/close median=1.1434 [mean=1.3551 +/-0.0469] microseconds
var: 0.171409 sd: 0.414016 runs: 300
Simple open/close median=1.1451 [mean=1.3604 +/-0.0492] microseconds
var: 0.188978 sd: 0.434716 runs: 300
NNN/YYY/ZZZ/FFF
Simple open/close median=1.0258 [mean=1.2390 +/-0.0529] microseconds
var: 0.218527 sd: 0.467468 runs: 300
Simple open/close median=1.0288 [mean=1.2522 +/-0.0489] microseconds
var: 0.186869 sd: 0.432284 runs: 300
XXX/../FFF
Simple open/close median=1.9067 [mean=2.0070 +/-0.0265] microseconds
var: 0.054636 sd: 0.233744 runs: 300
Simple open/close median=1.9052 [mean=2.0134 +/-0.0295] microseconds
var: 0.067930 sd: 0.260633 runs: 300
XXX/YYY/../../AAA/BBB/../../FFF
Simple open/close median=2.1170 [mean=2.2358 +/-0.0365] microseconds
var: 0.104043 sd: 0.322557 runs: 300
Simple open/close median=2.1003 [mean=2.2050 +/-0.0277] microseconds
var: 0.059771 sd: 0.244480 runs: 300
chmod
DIR0
Simple chmod median=1.5073 [mean=1.5094 +/-0.0008] microseconds
var: 0.000045 sd: 0.006707 runs: 300
Simple chmod median=1.5005 [mean=1.5049 +/-0.0036] microseconds
var: 0.001031 sd: 0.032105 runs: 300
DIR10
Simple chmod median=1.5105 [mean=1.5112 +/-0.0004] microseconds
var: 0.000012 sd: 0.003517 runs: 300
Simple chmod median=1.5129 [mean=1.5140 +/-0.0006] microseconds
var: 0.000025 sd: 0.005034 runs: 300
DIR100
Simple chmod median=1.4978 [mean=1.5002 +/-0.0008] microseconds
var: 0.000044 sd: 0.006644 runs: 300
Simple chmod median=1.4986 [mean=1.4998 +/-0.0006] microseconds
var: 0.000024 sd: 0.004863 runs: 300
DIR1000
Simple chmod median=1.5031 [mean=1.5037 +/-0.0004] microseconds
var: 0.000015 sd: 0.003918 runs: 300
Simple chmod median=1.4982 [mean=1.4987 +/-0.0005] microseconds
var: 0.000017 sd: 0.004133 runs: 300
DIR10000
Simple chmod median=1.5000 [mean=1.5104 +/-0.0085] microseconds
var: 0.005691 sd: 0.075440 runs: 300
Simple chmod median=1.4962 [mean=1.4977 +/-0.0007] microseconds
var: 0.000037 sd: 0.006091 runs: 300
rename
DIR0
Simple rename median=4.3412 [mean=4.5044 +/-0.0774] microseconds
var: 0.467785 sd: 0.683948 runs: 300
Simple rename median=4.3242 [mean=4.4593 +/-0.0558] microseconds
var: 0.243436 sd: 0.493393 runs: 300
DIR10
Simple rename median=4.9872 [mean=5.1361 +/-0.0711] microseconds
var: 0.395092 sd: 0.628564 runs: 300
Simple rename median=5.0441 [mean=5.0370 +/-0.0061] microseconds
var: 0.002923 sd: 0.054063 runs: 300
DIR100
Simple rename median=4.9964 [mean=5.1442 +/-0.0742] microseconds
var: 0.430474 sd: 0.656105 runs: 300
Simple rename median=5.0445 [mean=5.0416 +/-0.0120] microseconds
var: 0.011194 sd: 0.105800 runs: 300
DIR1000
Simple rename median=4.9845 [mean=5.1282 +/-0.0677] microseconds
var: 0.358090 sd: 0.598406 runs: 300
Simple rename median=5.0471 [mean=5.0451 +/-0.0103] microseconds
var: 0.008237 sd: 0.090756 runs: 300
DIR10000
Simple rename median=4.9964 [mean=5.1478 +/-0.0737] microseconds
var: 0.424529 sd: 0.651559 runs: 300
Simple rename median=4.9825 [mean=5.1054 +/-0.0639] microseconds
var: 0.319208 sd: 0.564985 runs: 300
mkstemp
FILE0,
Simple mkstemp median=12.1161 [mean=12.0418 +/-0.0220] microseconds
var: 0.037909 sd: 0.194703 runs: 300
Simple mkstemp median=12.0065 [mean=12.5739 +/-0.2383] microseconds
var: 4.433779 sd: 2.105654 runs: 300
FILE10,
Simple mkstemp median=12.3333 [mean=12.3107 +/-0.0477] microseconds
var: 0.177861 sd: 0.421736 runs: 300
Simple mkstemp median=12.4115 [mean=12.3578 +/-0.0230] microseconds
var: 0.041201 sd: 0.202981 runs: 300
FILE100,
Simple mkstemp median=14.1658 [mean=14.1391 +/-0.0352] microseconds
var: 0.096515 sd: 0.310668 runs: 300
Simple mkstemp median=14.0754 [mean=14.6226 +/-0.2178] microseconds
var: 3.705642 sd: 1.925004 runs: 300
FILE1000,
Simple mkstemp median=17.6864 [mean=17.6896 +/-0.0335] microseconds
var: 0.087457 sd: 0.295731 runs: 300
Simple mkstemp median=17.7267 [mean=17.7408 +/-0.0231] microseconds
var: 0.041653 sd: 0.204090 runs: 300
FILE10000,
Simple mkstemp median=18.2997 [mean=18.2899 +/-0.0278] microseconds
var: 0.060245 sd: 0.245449 runs: 300
Simple mkstemp median=18.3661 [mean=18.7377 +/-0.1909] microseconds
var: 2.846606 sd: 1.687189 runs: 300
readdir
FILE0,
Simple readdir median=4.7133 [mean=4.7005 +/-0.0105] microseconds
var: 0.008640 sd: 0.092952 runs: 300
Simple readdir median=4.7382 [mean=4.7298 +/-0.0093] microseconds
var: 0.006816 sd: 0.082557 runs: 300
FILE10,
Simple readdir median=7.8227 [mean=7.8351 +/-0.0074] microseconds
var: 0.004320 sd: 0.065726 runs: 300
Simple readdir median=7.8251 [mean=7.8318 +/-0.0064] microseconds
var: 0.003214 sd: 0.056692 runs: 300
FILE100,
Simple readdir median=37.9407 [mean=37.9916 +/-0.0272] microseconds
var: 0.057637 sd: 0.240076 runs: 300
Simple readdir median=37.2230 [mean=37.2814 +/-0.0375] microseconds
var: 0.109620 sd: 0.331090 runs: 300
FILE1000,
Simple readdir median=392.7692 [mean=393.2500 +/-0.1673] microseconds
var: 2.186940 sd: 1.478831 runs: 300
Simple readdir median=394.6923 [mean=394.4895 +/-0.2133] microseconds
var: 3.552738 sd: 1.884871 runs: 300
FILE10000,
Simple readdir median=3904.0000 [mean=3906.6100 +/-1.2472] microseconds
var: 121.477826 sd: 11.021698 runs: 300
Simple readdir median=3941.0000 [mean=3943.0550 +/-1.6803] microseconds
var: 220.497801 sd: 14.849168 runs: 300
rename-creat
Creating benchmark environment...done.
Simple rename-create median=12.8961 [mean=13.7555 +/-0.3549] microseconds
var: 9.837528 sd: 3.136483 runs: 300
Simple rename-create median=13.0416 [mean=12.9491 +/-0.0268] microseconds
var: 0.055950 sd: 0.236538 runs: 300
open-unlink
Creating benchmark environment...done.
Simple open-unlink median=11.1903 [mean=12.0262 +/-0.3293] microseconds
var: 8.466363 sd: 2.909702 runs: 300
Simple open-unlink median=11.2495 [mean=12.0415 +/-0.3062] microseconds
var: 7.320019 sd: 2.705553 runs: 300
Running lm_symlink-unlink as part of whole set.
symlink
Creating benchmark environment...done.
Simple symlink-unlink median=9.3716 [mean=9.3743 +/-0.0274] microseconds
var: 0.058533 sd: 0.241937 runs: 300
Simple symlink-unlink median=9.3537 [mean=9.3497 +/-0.0215] microseconds
var: 0.036230 sd: 0.190342 runs: 300
fstatat
Creating benchmark environment...done.
fstatat /test/FFF
Simple fstatat median=0.9153 [mean=0.9157 +/-0.0002] microseconds
var: 0.000003 sd: 0.001746 runs: 300
Simple fstatat median=0.9089 [mean=0.9097 +/-0.0004] microseconds
var: 0.000010 sd: 0.003129 runs: 300
openat
Creating benchmark environment...done.
openat /test/FFF
Simple openat/close median=1.8632 [mean=1.9830 +/-0.0334] microseconds
var: 0.087134 sd: 0.295185 runs: 300
Simple openat/close median=1.8593 [mean=1.9708 +/-0.0275] microseconds
var: 0.059013 sd: 0.242927 runs: 300
>
> The last paper mentioning about performance of LSM was about 20 years ago, where Chris was using a setup of 4 700MHz CPU, 128MB memory with Disk.
>
> Due to the change of hardware, performance on filesystem changes a lot.
>
>
> sec1.png
>
> --
> V/R,
>
> Wenhui Zhang
>
> Email: wenhui@xxxxxxxxxxxxxx <mailto:wenhui@xxxxxxxxxxxxxx> <mailto:wenhui@xxxxxxxxxxxxxx <mailto:wenhui@xxxxxxxxxxxxxx>>
> Telephone: 1-(703) 424 3193
>
>
>
>
>
>
--
V/R,
Wenhui Zhang
Email: wenhui@xxxxxxxxxxxxxx <mailto:wenhui@xxxxxxxxxxxxxx>
Telephone: 1-(703) 424 3193
