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Database lock for Sqlite #773

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admaio opened this issue Aug 22, 2019 · 1 comment
Open

Database lock for Sqlite #773

admaio opened this issue Aug 22, 2019 · 1 comment

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@admaio
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@admaio admaio commented Aug 22, 2019

I have tried to store the results of several simulations for a parameter study in a single .sca and .vec files:

output-vector-file = ${configname}/v.vec
output-scalar-file = ${configname}/s.sca

using the Sqlite manager:

outputvectormanager-class="omnetpp::envir::SqliteOutputVectorManager"
outputscalarmanager-class="omnetpp::envir::SqliteOutputScalarManager"

but the simulations crash and return the message:

<!> omnetpp::common::opp_runtime_error: SQLite error 'database is locked' on file '/home/..../s.sca'

The issue is solved by redirecting the scalar output of each simulation in a separate .sca file, while still redirecting the vector outputs in a single .vec file for all the simulations.

Why does the database lock issue happen only for .sca files? How can it be fixed so that manual merge of the databases contained in all the .sca files can be avoided?

Thanks.

(System: OMNeT++ 5.5, Ubuntu 16.04.6 LTS)

@admaio admaio added the new label Aug 22, 2019
@avarga

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@avarga avarga commented Sep 26, 2019

I am unable to reproduce this with either omnetpp-5.5.1 or omnetpp-devel (current master branch), on Ubuntu 18.04 LTS.

I tried the following:

cd samples/aloha
./aloha_dbg omnetpp.ini _sqlite.ini -c PureAlohaExperiment -u Cmdenv

where _sqlite.ini was:

outputvectormanager-class = omnetpp::envir::SqliteOutputVectorManager
outputscalarmanager-class = omnetpp::envir::SqliteOutputScalarManager
output-scalar-file-append = true
output-scalar-file = "results/General.sca"

It run through without error, and produced a correct SQLite General.sca file.

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