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quickstart_traceUtils.md

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Other trace utilities

We also provide some trace utilities to help you use the traces and debug applications.

tracePrint

Print requests from a trace.

# print 10 requests from a trace
./bin/tracePrint ../data/cloudPhysicsIO.vscsi vscsi -n 10

traceConv

Convert a trace to oracleGeneral format so you can run it faster (10x speedup) using less memory. Meanwhile, the generated trace has a smaller size, contains next request time.

# the first parameter is the input trace, the second parameter is trace type, the third parameter is the output trace path
./bin/traceConv ../data/cloudPhysicsIO.txt txt cloudPhysicsIO.oracleGeneral.bin

Note that the conversion supports all trace types including csv trace. Moreover, if the object id is numeric, add the option -e obj_id_is_num=1 to the command line, which reduces memory usage.

We can also sample a trace to reduce the size of the trace.

# sample 1% of the trace
./bin/traceConv ../data/cloudPhysicsIO.vscsi vscsi ../data/cloudPhysicsIO.oracleGeneral -s 0.01

traceFilter

traceFilter simulates a multi-layer cache hierarchy. It filters the trace based on the cache hit/miss information and generates a trace for the second layer. The generated trace is in oracleGeneral format.

# filter trace using a cache with a size 0.01 of the working set size and the FIFO eviction policy
./bin/traceFilter ../data/trace.vscsi vscsi --filter-type fifo --filter-size 0.01 --ignore-obj-size 1