Hi Kapil, Because the source code do a execvp after pthread_create, this is unusual mix of execvp and multi-thread process. According to linux system call document, execvp will reset all the memory space to the new process. So libmtcp.so should be wiped out also. But I can’t observe this behavior at dmtcp_launch.
For checkpoint’s purpose, we need libmtcp.so to be at memory for sure, I just don’t know the mechanism works. I need to change to behavior of dmtcp to be triggered by a function call, and eliminate the need of coordinator, I am planing to modify the dmtcpworkor class, and add a member function to trigger checkpoint. Before I modify it, I need to understand how it works. Thanks. Nausca. From: Kapil Arya <kapil.arya...@gmail.com<mailto:kapil.arya...@gmail.com>> Date: 2015年10月6日 星期二 05:03 To: Nausca <nau...@cadence.com<mailto:nau...@cadence.com>> Cc: "Sourceforge. Net Dmtcp-Forum@Lists." <dmtcp-forum@lists.sourceforge.net<mailto:dmtcp-forum@lists.sourceforge.net>> Subject: Re: [Dmtcp-forum] how dmtcp_launch is working? Hi Nausca, Apparently, DMTCP libraries are always part of the process memory map. That was true for MTCP/DMTCP-1.1.8 as well. Is there a particular case that requires those files to be not present in memory? Best, Kapil On Mon, Oct 5, 2015 at 7:41 AM, Nausca Hsu <nau...@cadence.com<mailto:nau...@cadence.com>> wrote: Hi, I recently download the 2.4.1 version to trace the source code, And I found the latest version is some kind of hack in _ini And _fini in the libmtcp.so before execvp a process’s main function. My question is, The source code use a pthread_create in dmtcpworker’s constructor, After the execvp, why the libmtcp.so is still at the memory, And did not get wiped out? I use dmtcp_launch cat /proc/self/maps And I can see the cat process still contains libmtcp.so in its memory space. I check the publication list. Did not found any hint. I am a 1.1.8 old user. Anybody can help me to understand the latest source code? Thanks. Nausca. ------------------------------------------------------------------------------ _______________________________________________ Dmtcp-forum mailing list Dmtcp-forum@lists.sourceforge.net<mailto:Dmtcp-forum@lists.sourceforge.net> https://lists.sourceforge.net/lists/listinfo/dmtcp-forum<https://urldefense.proofpoint.com/v2/url?u=https-3A__lists.sourceforge.net_lists_listinfo_dmtcp-2Dforum&d=BQMFaQ&c=aUq983L2pue2FqKFoP6PGHMJQyoJ7kl3s3GZ-_haXqY&r=yTrYtXirB43TLybS8rmjdSEHLuNfd5w_za3LlC3F5ag&m=XGUosmCrqndbLry0X0DygUIYvmRAWnlcvWCAqENU5Rw&s=IYnv1txI01RXpYQbSl79YnUsD2JVkjluh9pmIq4PRRk&e=>
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