set number 50000 set transactions 50000 set read 4096 set write 4096 set bias read 5 set bias create 5 set report terse set size 1000 200000 set buffering true|false
1. mkfs.ext4 2. mount -o (nodiscard|discard) 3. ./postmark 4. umount 5. repeat 1. - 4. ten times
| BUFFERING ENABLED* | BUFFERING DISABLED* | -------------------------------------------------------------------------------------------------------------- Type |NODISCARD DISCARD DIFF |NODISCARD DISCARD DIFF | ============================================================================================================== Total_duration |377.80 598.80 58.50% |370.20 594.60 60.62% | Duration_of_transactions |297.20 521.60 75.50% |285.10 515.90 80.95% | Transactions/s |168.30 95.86 -43.04% |175.51 96.93 -44.77% | Files_created/s |197.92 124.86 -36.91% |201.98 125.75 -37.74% | Creation_alone/s |773.10 785.16 1.56% |772.00 784.03 1.56% | Creation_mixed_with_transaction/s |83.34 47.47 -43.04% |86.92 48.00 -44.78% | Read/s |84.06 47.88 -43.04% |87.67 48.41 -44.78% | Append/s |84.23 47.98 -43.04% |87.85 48.51 -44.78% | Deleted/s |197.92 124.86 -36.91% |201.98 125.75 -37.74% | Deletion_alone/s |765.71 777.65 1.56% |764.62 776.53 1.56% | Deletion_mixed_with_transaction/s |84.95 48.39 -43.04% |88.59 48.93 -44.77% | Read_B/s |7288249.95 4597787.15 -36.92% |7437901.50 4630656.70 -37.74% | Write_B/s |22807978.80 14388396.10 -36.92% |23276301.20 14491259.30 -37.74% | ==============================================================================================================[nodiscard with buffering] [discard with buffering] [nodiscard without buffering] [discard without buffering]
| BUFFERING ENABLED* | BUFFERING DISABLED* | -------------------------------------------------------------------------------------------------------------- Type |NODISCARD DISCARD DIFF |NODISCARD DISCARD DIFF | ============================================================================================================== Total_duration |182.40 212.10 16.28% |180.30 209.10 15.97% | Duration_of_transactions |120.40 148.80 23.59% |117.60 146.70 24.74% | Transactions/s |415.30 336.06 -19.08% |425.20 340.84 -19.84% | Files_created/s |409.95 352.54 -14.00% |414.73 357.56 -13.78% | Creation_alone/s |970.40 963.67 -0.69% |954.59 966.58 1.26% | Creation_mixed_with_transaction/s |205.67 166.42 -19.08% |210.57 168.79 -19.84% | Read/s |207.44 167.85 -19.09% |212.38 170.24 -19.84% | Append/s |207.86 168.19 -19.08% |212.81 170.59 -19.84% | Deleted/s |409.95 352.54 -14.00% |414.73 357.56 -13.78% | Deletion_alone/s |961.13 954.45 -0.70% |945.46 957.33 1.26% | Deletion_mixed_with_transaction/s |209.63 169.63 -19.08% |214.63 172.05 -19.84% | Read_B/s |15096194.90 12981826.50 -14.01% |15272242.70 13166944.50 -13.79% | Write_B/s |47242300.80 40625558.00 -14.01% |47793228.00 41204869.60 -13.79% | ==============================================================================================================[nodiscard with buffering] [discard with buffering] [nodiscard without buffering] [discard without buffering]
| BUFFERING ENABLED* | BUFFERING DISABLED* | -------------------------------------------------------------------------------------------------------------- Type |NODISCARD DISCARD DIFF |NODISCARD DISCARD DIFF | ============================================================================================================== Total_duration |220.20 2628.50 1093.69% |218.40 2651.60 1114.10% | Duration_of_transactions |157.90 2479.90 1470.55% |155.80 2493.50 1500.45% | Transactions/s |316.68 20.16 -93.63% |320.93 20.06 -93.75% | Files_created/s |339.52 28.45 -91.62% |342.32 28.20 -91.76% | Creation_alone/s |969.86 981.15 1.16% |971.11 971.11 -0.00% | Creation_mixed_with_transaction/s |156.83 9.99 -93.63% |158.93 9.93 -93.75% | Read/s |158.17 10.07 -93.63% |160.30 10.02 -93.75% | Append/s |158.50 10.09 -93.63% |160.63 10.04 -93.75% | Deleted/s |339.52 28.45 -91.62% |342.32 28.20 -91.76% | Deletion_alone/s |960.59 971.77 1.16% |961.83 961.83 -0.00% | Deletion_mixed_with_transaction/s |159.86 10.18 -93.63% |162.00 10.12 -93.75% | Read_B/s |12502731.80 1047732.08 -91.62% |12605752.30 1038640.13 -91.76% | Write_B/s |39126271.20 3278791.40 -91.62% |39448664.80 3250338.88 -91.76% | ==============================================================================================================[nodiscard with buffering] [discard with buffering] [nodiscard without buffering] [discard without buffering]
| BUFFERING ENABLED | BUFFERING DISABLED | -------------------------------------------------------------------------------------------------------------- Type |NODISCARD DISCARD DIFF |NODISCARD DISCARD DIFF | ============================================================================================================== Total_duration |327.50 333.50 1.83% |327.20 330.00 0.86% | Duration_of_transactions |239.40 243.60 1.75% |238.20 241.30 1.30% | Transactions/s |209.30 205.34 -1.89% |209.96 207.25 -1.29% | Files_created/s |228.47 224.20 -1.87% |228.52 226.58 -0.85% | Creation_alone/s |632.22 620.72 -1.82% |623.66 627.51 0.62% | Creation_mixed_with_transaction/s |103.65 101.69 -1.89% |103.97 102.64 -1.28% | Read/s |104.54 102.56 -1.89% |104.87 103.52 -1.29% | Append/s |104.76 102.77 -1.90% |105.08 103.73 -1.28% | Deleted/s |228.47 224.20 -1.87% |228.52 226.58 -0.85% | Deletion_alone/s |626.18 614.78 -1.82% |617.70 621.51 0.62% | Deletion_mixed_with_transaction/s |105.65 103.65 -1.89% |105.98 104.62 -1.28% | Read_B/s |8413387.05 8256152.15 -1.87% |8415148.45 8343683.55 -0.85% | Write_B/s |26329003.20 25836949.00 -1.87% |26334515.00 26110871.40 -0.85% | ==============================================================================================================[nodiscard with buffering] [discard with buffering] [nodiscard without buffering] [discard without buffering]
| BUFFERING ENABLED | BUFFERING DISABLED | -------------------------------------------------------------------------------------------------------------- Type |NODISCARD DISCARD DIFF |NODISCARD DISCARD DIFF | ============================================================================================================== Total_duration |177.10 181.00 2.20% |172.60 177.50 2.84% | Duration_of_transactions |123.10 127.80 3.82% |119.10 124.30 4.37% | Transactions/s |406.22 391.26 -3.68% |419.84 402.27 -4.18% | Files_created/s |422.15 413.06 -2.15% |433.16 421.21 -2.76% | Creation_alone/s |1018.53 1026.96 0.83% |1020.58 1031.04 1.02% | Creation_mixed_with_transaction/s |201.17 193.77 -3.68% |207.91 199.22 -4.18% | Read/s |202.89 195.43 -3.68% |209.70 200.93 -4.18% | Append/s |203.31 195.83 -3.68% |210.13 201.34 -4.18% | Deleted/s |422.15 413.06 -2.15% |433.16 421.21 -2.76% | Deletion_alone/s |1008.79 1017.14 0.83% |1010.82 1021.18 1.02% | Deletion_mixed_with_transaction/s |205.05 197.50 -3.68% |211.92 203.06 -4.18% | Read_B/s |15545372.04 15210638.77 -2.15% |15950766.86 15510515.62 -2.76% | Write_B/s |48647963.38 47600443.14 -2.15% |49916613.13 48538883.09 -2.76% | ==============================================================================================================[nodiscard with buffering] [discard with buffering] [nodiscard without buffering] [discard without buffering]
| BUFFERING ENABLED | BUFFERING DISABLED | -------------------------------------------------------------------------------------------------------------- Type |NODISCARD DISCARD DIFF |NODISCARD DISCARD DIFF | ============================================================================================================== Total_duration |144.80 143.40 -0.97% |140.00 138.60 -1.00% | Duration_of_transactions |95.40 94.00 -1.47% |90.60 90.40 -0.22% | Transactions/s |524.21 532.01 1.49% |551.89 553.22 0.24% | Files_created/s |516.34 521.37 0.97% |534.02 539.45 1.02% | Creation_alone/s |1116.16 1131.31 1.36% |1121.21 1141.65 1.82% | Creation_mixed_with_transaction/s |259.60 263.46 1.49% |273.31 273.96 0.24% | Read/s |261.83 265.73 1.49% |275.66 276.32 0.24% | Append/s |262.37 266.27 1.49% |276.22 276.89 0.24% | Deleted/s |516.34 521.37 0.97% |534.02 539.45 1.02% | Deletion_alone/s |1105.49 1120.50 1.36% |1110.49 1130.73 1.82% | Deletion_mixed_with_transaction/s |264.61 268.55 1.49% |278.58 279.25 0.24% | Read_B/s |19013824.01 19199189.31 0.97% |19664863.96 19864982.58 1.02% | Write_B/s |59502198.56 60082284.04 0.97% |61539574.58 62165829.34 1.02% | ==============================================================================================================[nodiscard with buffering] [discard with buffering] [nodiscard without buffering] [discard without buffering]
Note: This test has been done a little bit differently, because I figure out that even that this device handles TRIM commands quite well, the performance of the device goes a bit down afterwards, as the firmware apparently process the request.
This behavior has bigger impact the bigger the TRIM range is. So after mke2fs (and whole device TRIM) there is some period of time when device performance is lower than normal.
The time it needs to completely process TRIM on background depends not only on the size of TRIM range, but also on how much writes as been done to the device between TRIM's.
There is a graph of performance stabilization right after the whole device trim. It has been measured without any writes in between, sadly I no longer have this device in my possessions so I can not test it.
