Last active
August 29, 2015 14:22
-
-
Save ssvb/958f15d6136082b9b2bd to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| https://gist.github.com/ssvb/56da061451216a37080f | |
| # This program runs a set of tests, which are repeatedly doing | |
| # memcpy over N bytes sized memory buffer. Each individual | |
| # test is calibrated to run a sufficient number of iterations | |
| # to make its duration close to 300 ms. | |
| # For each line in the report below, tests are run 20 | |
| # times normally and 20 times slightly slower than normal | |
| # (the difference is shown in the first column). The timings | |
| # of these runs are also measured using gettimeofday(...) | |
| # and clock_gettime(CLOCK_PROCESS_CPUTIME_ID, ...) functions | |
| # to see whether it is possible to reliably distinguish | |
| # between the slower runs and the normal runs. The percentage | |
| # of successful identifications is shown in the second and | |
| # third columns (100% means that we could perfectly distinguish | |
| # between normal and slower runs in all 20 attempts). | |
| === NVIDIA Tegra K1 (quad ARM Cortex-A15 2.2GHz), idle Android === | |
| test_duration = 300 ms (the first command line argument) | |
| working_set_size = 0 bytes (the second command line argument) | |
| difference | detected by gettime | detected by cputime | |
| -----------+---------------------+-------------------- | |
| 0.010% | 65% | 65% | |
| 0.012% | 55% | 80% | |
| 0.014% | 45% | 60% | |
| 0.017% | 55% | 85% | |
| 0.021% | 45% | 80% | |
| 0.025% | 75% | 100% | |
| 0.030% | 70% | 100% | |
| 0.036% | 70% | 85% | |
| 0.043% | 85% | 95% | |
| 0.052% | 80% | 95% | |
| 0.062% | 80% | 100% | |
| 0.074% | 90% | 100% | |
| 0.089% | 90% | 100% | |
| 0.107% | 95% | 100% | |
| 0.128% | 85% | 100% | |
| 0.154% | 90% | 100% | |
| 0.185% | 100% | 100% | |
| 0.222% | 85% | 100% | |
| 0.266% | 100% | 100% | |
| 0.319% | 95% | 95% | |
| 0.383% | 90% | 100% | |
| 0.460% | 95% | 95% | |
| 0.552% | 95% | 100% | |
| 0.662% | 100% | 100% | |
| 0.795% | 100% | 100% | |
| 0.954% | 90% | 100% | |
| 1.145% | 95% | 100% | |
| 1.374% | 95% | 100% | |
| 1.648% | 100% | 100% | |
| 1.978% | 95% | 100% | |
| 2.374% | 100% | 100% | |
| 2.849% | 100% | 100% | |
| 3.418% | 95% | 100% | |
| 4.102% | 100% | 100% | |
| 4.922% | 100% | 100% | |
| 5.907% | 100% | 100% | |
| 7.088% | 100% | 100% | |
| 8.506% | 100% | 100% | |
| 10.207% | 100% | 100% | |
| ------------------------------------------------------ | |
| test_duration = 300 ms (the first command line argument) | |
| working_set_size = 8000 bytes (the second command line argument) | |
| difference | detected by gettime | detected by cputime | |
| -----------+---------------------+-------------------- | |
| 0.010% | 65% | 75% | |
| 0.012% | 60% | 75% | |
| 0.014% | 55% | 75% | |
| 0.017% | 55% | 80% | |
| 0.021% | 60% | 100% | |
| 0.025% | 55% | 95% | |
| 0.030% | 65% | 100% | |
| 0.036% | 75% | 100% | |
| 0.043% | 50% | 85% | |
| 0.052% | 75% | 100% | |
| 0.062% | 85% | 100% | |
| 0.074% | 85% | 100% | |
| 0.089% | 85% | 100% | |
| 0.107% | 90% | 100% | |
| 0.128% | 90% | 95% | |
| 0.154% | 95% | 100% | |
| 0.185% | 85% | 100% | |
| 0.222% | 100% | 100% | |
| 0.266% | 95% | 100% | |
| 0.319% | 95% | 100% | |
| 0.383% | 95% | 100% | |
| 0.460% | 100% | 100% | |
| 0.552% | 100% | 100% | |
| 0.662% | 95% | 100% | |
| 0.795% | 95% | 100% | |
| 0.954% | 95% | 100% | |
| 1.145% | 95% | 100% | |
| 1.374% | 100% | 100% | |
| 1.648% | 90% | 100% | |
| 1.978% | 95% | 100% | |
| 2.374% | 95% | 100% | |
| 2.848% | 100% | 100% | |
| 3.418% | 100% | 100% | |
| 4.102% | 85% | 100% | |
| 4.922% | 100% | 100% | |
| 5.907% | 100% | 100% | |
| ------------------------------------------------------ | |
| test_duration = 300 ms (the first command line argument) | |
| working_set_size = 100000 bytes (the second command line argument) | |
| difference | detected by gettime | detected by cputime | |
| -----------+---------------------+-------------------- | |
| 0.009% | 60% | 50% | |
| 0.013% | 55% | 75% | |
| 0.017% | 50% | 60% | |
| 0.021% | 45% | 70% | |
| 0.030% | 70% | 80% | |
| 0.034% | 70% | 90% | |
| 0.043% | 70% | 95% | |
| 0.051% | 85% | 100% | |
| 0.060% | 75% | 95% | |
| 0.072% | 100% | 100% | |
| 0.085% | 75% | 100% | |
| 0.106% | 90% | 95% | |
| 0.128% | 90% | 100% | |
| 0.153% | 90% | 95% | |
| 0.183% | 90% | 100% | |
| 0.221% | 100% | 100% | |
| 0.264% | 95% | 100% | |
| 0.319% | 95% | 100% | |
| 0.383% | 95% | 100% | |
| 0.459% | 95% | 100% | |
| 0.548% | 95% | 100% | |
| 0.659% | 95% | 100% | |
| 0.795% | 95% | 100% | |
| 0.952% | 95% | 100% | |
| 1.144% | 95% | 100% | |
| 1.373% | 95% | 100% | |
| 1.645% | 95% | 100% | |
| 1.977% | 100% | 100% | |
| 2.372% | 90% | 100% | |
| 2.848% | 95% | 100% | |
| 3.418% | 95% | 100% | |
| 4.098% | 100% | 100% | |
| 4.918% | 100% | 100% | |
| 5.905% | 100% | 100% | |
| 7.086% | 100% | 100% | |
| 8.502% | 100% | 100% | |
| 10.207% | 100% | 100% | |
| 12.247% | 100% | 100% | |
| 14.696% | 100% | 100% | |
| 17.633% | 100% | 100% | |
| 21.161% | 100% | 100% | |
| 25.395% | 100% | 100% | |
| 30.475% | 100% | 100% |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment