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‎README.md‎

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@@ -7,7 +7,7 @@ Catfs is a caching filesystem written in Rust.
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Catfs allows you to have cached access to another (possibily remote)
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filesystem. Caching semantic is read-ahead and write-through (see
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[Current Status](#current-status)). Currently it only provides a data
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cache.
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cache and all metadata operations hit the source filesystem.
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Catfs is ALPHA software. Don't use this if you value your data.
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@@ -35,6 +35,17 @@ $ catfs <from> <to> <mountpoint>
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Catfs will expose files in `<from>` under `<mountpoint>`, and cache
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them to `<to>` as they are accessed.
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# Benchmark
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Compare running catfs with two local directories on the same
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filesystem with direct access. This is not a realistic use case but
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should give you an idea of the worst case slowdown.
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![Benchmark result](/bench/bench.png?raw=true "Benchmark")
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Write is twice as slow as expected since we are writing twice the
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amount. However it's not clear why `ls` is so slow.
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# License
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Copyright (C) 2017 Ka-Hing Cheung

‎bench/bench.catfs‎

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create_files 0.061
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rm_files 0.078
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create_files 0.044
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rm_files 0.093
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create_files 0.043
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rm_files 0.095
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create_files 0.062
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rm_files 0.093
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create_files 0.057
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rm_files 0.151
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create_files 0.049
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rm_files 0.097
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create_files 0.051
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rm_files 0.124
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create_files 0.064
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rm_files 0.093
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create_files 0.047
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rm_files 0.099
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create_files 0.044
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rm_files 0.091
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create_files_parallel 0.052
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rm_files_parallel 0.076
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create_files_parallel 0.049
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rm_files_parallel 0.048
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create_files_parallel 0.038
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rm_files_parallel 0.053
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create_files_parallel 0.060
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rm_files_parallel 0.052
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create_files_parallel 0.064
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rm_files_parallel 0.052
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create_files_parallel 0.046
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rm_files_parallel 0.062
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create_files_parallel 0.054
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rm_files_parallel 0.079
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create_files_parallel 0.060
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rm_files_parallel 0.058
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create_files_parallel 0.057
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rm_files_parallel 0.082
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create_files_parallel 0.063
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rm_files_parallel 0.054
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write_md5 10.257
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read_md5 2.175
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read_first_byte 0.012
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write_md5 8.854
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read_md5 2.164
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read_first_byte 1.253
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write_md5 9.548
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read_md5 2.200
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read_first_byte 1.241
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write_md5 8.711
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read_md5 2.205
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read_first_byte 1.056
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write_md5 8.129
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read_md5 2.165
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read_first_byte 0.009
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write_md5 10.159
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read_md5 2.194
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read_first_byte 1.004
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write_md5 8.396
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read_md5 2.169
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read_first_byte 0.007
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write_md5 9.489
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read_md5 2.162
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read_first_byte 0.680
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write_md5 8.230
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read_md5 2.174
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read_first_byte 0.545
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write_md5 8.152
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read_md5 2.147
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read_first_byte 2.135
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ls_files 0.083
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ls_files 0.054
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ls_files 0.073
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ls_files 0.069
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ls_files 0.060
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ls_files 0.057
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ls_files 0.055
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ls_files 0.080
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ls_files 0.080
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ls_files 0.070

‎bench/bench.data‎

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#operation,time
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Create 100 files 0.0522 0.043 0.064 0.0199 0.017 0.023
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Unlink 100 files 0.0958888888889 0.078 0.124 0.0857777777778 0.078 0.093
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Create 100 files (parallel) 0.0561111111111 0.046 0.064 0.0411111111111 0.039 0.046
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Unlink 100 files (parallel) 0.0616 0.048 0.082 0.0488888888889 0.041 0.055
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ls with 1000 files 0.0681 0.054 0.083 0.0232222222222 0.022 0.025
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Write 1GB 8.9925 8.129 10.257 4.9699 4.395 5.813
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Read 1GB 2.1755 2.147 2.205 2.21633333333 2.149 2.292
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Time to 1st byte 0.645222222222 0.007 1.253 0.004 0.003 0.005

‎bench/bench.local‎

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create_files 0.021
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rm_files 0.084
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create_files 0.020
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rm_files 0.080
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create_files 0.017
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rm_files 0.078
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create_files 0.019
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rm_files 0.127
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create_files 0.022
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rm_files 0.088
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create_files 0.017
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rm_files 0.088
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create_files 0.020
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rm_files 0.085
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create_files 0.021
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rm_files 0.093
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create_files 0.023
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rm_files 0.083
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create_files 0.019
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rm_files 0.093
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create_files_parallel 0.039
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rm_files_parallel 0.051
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create_files_parallel 0.040
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rm_files_parallel 0.041
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create_files_parallel 0.024
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rm_files_parallel 0.049
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create_files_parallel 0.040
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rm_files_parallel 0.050
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create_files_parallel 0.046
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rm_files_parallel 0.048
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create_files_parallel 0.040
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rm_files_parallel 0.049
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create_files_parallel 0.041
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rm_files_parallel 0.055
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create_files_parallel 0.040
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rm_files_parallel 0.049
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create_files_parallel 0.040
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rm_files_parallel 0.048
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create_files_parallel 0.044
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rm_files_parallel 0.059
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write_md5 4.950
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read_md5 2.256
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read_first_byte 0.010
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write_md5 4.566
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read_md5 2.264
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read_first_byte 0.004
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write_md5 5.370
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read_md5 2.360
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read_first_byte 0.004
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write_md5 5.813
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read_md5 2.189
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read_first_byte 0.003
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write_md5 4.557
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read_md5 2.230
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read_first_byte 0.003
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write_md5 4.603
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read_md5 2.206
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read_first_byte 0.005
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write_md5 4.911
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read_md5 2.193
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read_first_byte 0.004
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write_md5 5.745
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read_md5 2.168
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read_first_byte 0.003
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write_md5 4.395
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read_md5 2.149
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read_first_byte 0.005
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write_md5 4.789
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read_md5 2.292
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read_first_byte 0.005
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ls_files 0.028
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ls_files 0.022
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ls_files 0.023
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ls_files 0.023
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ls_files 0.024
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ls_files 0.025
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ls_files 0.023
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ls_files 0.023
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ls_files 0.023
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ls_files 0.023

‎bench/bench.png‎

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