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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 output is in the same directory with suffic oracleGeneral
./bin/traceConv ../data/cloudPhysicsIO.txt txt

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

# a trace using space as the delimiter and numeric object id
./bin/traceConv /disk/trace.csv csv -t "time-col=1,obj-id-col=2,obj-size-col=3,delimiter= ,obj-id-is-num=1"

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

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