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Cache Latencies and Sizes on RAMCloud Test Cluster

Cache Latencies and Sizes on RAMCloud Test Cluster

Apr 17, 2014

Here are the appropriate latencies we incur from missing each layer of cache.

  • L1 Cache: 3 ns

  • L2 Cache: 13 ns

  • L3 Cache: 85 ns

Here is some general information about cache size and shape on the rcXX machines.

/sys/devices/system/cpu/cpu0/cache/index0/coherency_line_size:64 /sys/devices/system/cpu/cpu0/cache/index0/level:1 /sys/devices/system/cpu/cpu0/cache/index0/number_of_sets:64 /sys/devices/system/cpu/cpu0/cache/index0/physical_line_partition:1 /sys/devices/system/cpu/cpu0/cache/index0/shared_cpu_list:0,4 /sys/devices/system/cpu/cpu0/cache/index0/shared_cpu_map:11 /sys/devices/system/cpu/cpu0/cache/index0/size:32K /sys/devices/system/cpu/cpu0/cache/index0/type:Data /sys/devices/system/cpu/cpu0/cache/index0/ways_of_associativity:8 /sys/devices/system/cpu/cpu0/cache/index1/coherency_line_size:64 /sys/devices/system/cpu/cpu0/cache/index1/level:1 /sys/devices/system/cpu/cpu0/cache/index1/number_of_sets:128 /sys/devices/system/cpu/cpu0/cache/index1/physical_line_partition:1 /sys/devices/system/cpu/cpu0/cache/index1/shared_cpu_list:0,4 /sys/devices/system/cpu/cpu0/cache/index1/shared_cpu_map:11 /sys/devices/system/cpu/cpu0/cache/index1/size:32K /sys/devices/system/cpu/cpu0/cache/index1/type:Instruction /sys/devices/system/cpu/cpu0/cache/index1/ways_of_associativity:4 /sys/devices/system/cpu/cpu0/cache/index2/coherency_line_size:64 /sys/devices/system/cpu/cpu0/cache/index2/level:2 /sys/devices/system/cpu/cpu0/cache/index2/number_of_sets:512 /sys/devices/system/cpu/cpu0/cache/index2/physical_line_partition:1 /sys/devices/system/cpu/cpu0/cache/index2/shared_cpu_list:0,4 /sys/devices/system/cpu/cpu0/cache/index2/shared_cpu_map:11 /sys/devices/system/cpu/cpu0/cache/index2/size:256K /sys/devices/system/cpu/cpu0/cache/index2/type:Unified /sys/devices/system/cpu/cpu0/cache/index2/ways_of_associativity:8 /sys/devices/system/cpu/cpu0/cache/index3/coherency_line_size:64 /sys/devices/system/cpu/cpu0/cache/index3/level:3 /sys/devices/system/cpu/cpu0/cache/index3/number_of_sets:8192 /sys/devices/system/cpu/cpu0/cache/index3/physical_line_partition:1 /sys/devices/system/cpu/cpu0/cache/index3/shared_cpu_list:0-7 /sys/devices/system/cpu/cpu0/cache/index3/shared_cpu_map:ff /sys/devices/system/cpu/cpu0/cache/index3/size:8192K /sys/devices/system/cpu/cpu0/cache/index3/type:Unified /sys/devices/system/cpu/cpu0/cache/index3/ways_of_associativity:16