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https://github.com/couchbase/moss

moss - a simple, fast, ordered, persistable, key-val storage library for golang
https://github.com/couchbase/moss

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moss - a simple, fast, ordered, persistable, key-val storage library for golang

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# Instructions for DGM testing for moss



dgm_moss_test.go is a moss component level test that exercises moss.



Included in the test is a simulator of the moss herder memory stalling

functionality.



The test can be configured to generate a Results*.json file that can be

used with python script graph/dgm-moss-ploy.py to plot the resutls.



## Steps



Here is an example shell script to exercise the test.



```

#!/bin/bash

findDisk()

{

    dev=`df ${MossStore} | grep -v Filesystem | awk {'print $1'}`

    dirName=`dirname ${dev}`

    devName=`basename ${dev} ${dirName}`

    echo ${devName}

}



clearCaches()

{

    sudo sync

    sudo sh -c "echo 1 > /proc/sys/vm/drop_caches"

    sudo sh -c "echo 2 > /proc/sys/vm/drop_caches"

    sudo sh -c "echo 3 > /proc/sys/vm/drop_caches"



}



MossStore="/mossstore/MossStoreTest"

mkdir -p -m=0777 ${MossStore}

diskMonitor=`findDisk`

runDesc="${gitInfo}"



go test -v -test.run TestMossDGM -test.timeout 99999s -runTime 5m -memQuota 4gb -keyLength 48 -valueLength 48 -keyOrder random -numWriters 1 -writeBatchSize 100000 -writeBatchThinkTime 1ms -numReaders 16 -readBatchSize 100 -readBatchThinkTime 1ms -outputToFile -dbPath ${MossStore} -diskMonitor ${diskMonitor} -runDescription ${runDesc} -dbCreate

```



## Ploting a graph of the results



The python script requires numpy, pandas, matploglib



```

python dgm-moss-plot.py Results_...json

```



This will process a Results...png file.



## Notes



This test only runs properly on Linux as it gathers stats from /proc.