Hi, Jilong, Your observation is basically correct. However, in examples/ibis.cpp, the configuration files provided on command line are read before the constructor of ibis::fileManager could be called, and therefore any specification of maxBytes should be honored when the constructor of ibis::fileManager is invoked by the function ibis::fileManager::instance().
If you are writing your own code to use FastBit, the way to ensure the same behavior is to make sure you read your configuration files and invoke ibis::init() before touching any other FastBit functions. If for whatever reason you have started working with FastBit code and have invoked ibis::fileManager::instance() somewhere, there is still one more option for you to forcefully change the value of maxBytes, through the function ibis::fileManager::adjustCacheSize (defined in fileManager.h). To see whether your specification has been passed to ibis::fileManager, set message/verboseness level to 4 or higher. Look for lines with fileManager.maxBytes in the output file. Hope this helps. John On 8/27/15 2:00 PM, wang jilong wrote: > Hi, John, > > > > In fastbit (2.0.2) index building utility ibis (with source code at > examples/ibis.cpp), > > setting “fileManager.maxBytes” via -c ibis.rc, or environment IBISRC > somehow all failed. > > It always sets to be the half of the physical memory. > > I like to increase it to 20G, given 32G RAM on my index building machine. > > > > Have checked the output file and read source file “examples/ibis.cpp” > and “fileManager.cpp”, > > It looks like that: > > 1. fileManager.maxBytes is a static data member, was first > initialized in fileManager::fileManager() > > 2. there is only one instance of fileManager. It is static, and > initialized in ibis::fileManager::instance() > > 3. may be due to C++ static objects always are initialized first, > the code above runs before main() prints “building indexes > (nthreads=8, indexingOption..” in examples/ibis.cpp main(); > > > > My question is: how shall we change fileManager.maxBytes for “ibis”, > the index building utility? > > > > I have searched our fastbit mail archive, found similar questions > without the final answer. > > > > May be I overlooked some not-so-obvious? > > > > Please help and thanks in advance. > > > > Jilong Wang > > > > > > > > _______________________________________________ > FastBit-users mailing list > [email protected] > https://hpcrdm.lbl.gov/cgi-bin/mailman/listinfo/fastbit-users > _______________________________________________ FastBit-users mailing list [email protected] https://hpcrdm.lbl.gov/cgi-bin/mailman/listinfo/fastbit-users
