The ability to run without dmtcp_launch is supported, unless we had a
regression.
The only difference when running without dmtcp_launch is that it’ll not invoke a
checkpoint and the DMTCP API functions will return DMTCP_NOT_PRESENT.
Could you please share an example program that demonstrates the bug?
> On Feb 29, 2016, at 12:50 PM, Stu Whitman <swhit...@groupw.com> wrote:
>
> Rohan,
>
> Thanks for the response. I have successfully followed the
> applic-initiated-ckpt example with my application. This worked for me even
> without compiling with the -fPIC option.
>
> I am now trying to follow section 4 in the plugin-tutorial.pdf document
> located in the doc folder. This is a short section, so I will paste it here:
> ---------------------------------------------------------
> 4 Application-Initiated Checkpoints
> Application-initiated checkpoints are even simpler than full-featured
> plugins. In the simplest form, the
> following code can be executed both **with dmtcp launch and without**.:
> #include <stdio.h>
> #include "dmtcp.h"
> int main() {
> if (dmtcpCheckpoint() == DMTCP_NOT_PRESENT) {
> printf("dmtcpcheckpoint: DMTCP not present. No checkpoint is
> taken.\n");
> }
> return 0;
> }
>
> For this program to be aware of DMTCP, it must be compiled with -fPIC and
> -ldl :
> gcc -fPIC -IDMTCP ROOT/dmtcp/include -o myapp myapp.c -ldl
>
> The most useful functions are:
> int dmtcpIsEnabled() — returns 1 when running with DMTCP; 0 otherwise.
> int dmtcpCheckpoint() — returns DMTCP AFTER CHECKPOINT, DMTCP AFTER RESTART,
> or
> DMTCP NOT PRESENT.
> int dmtcpDelayCheckpointsLock() — DMTCP will block any checkpoint requests.
> int dmtcpDelayCheckpointsUnlock() — DMTCP will execute any blocked checkpoint
> requests, and will
> permit new checkpoint requests.
>
> The last two functions follow the common pattern of returning 0 on success
> and DMTCP NOT PRESENT
> if DMTCP is not present. See the subdirectories DMTCP
> ROOT/test/plugin/applic-initiated-ckpt and
> DMTCP
> ---------------------------------------------------------
>
> I am now compiling the application with -fPIC and -ldl as instructed, but get
> the error message I reported when running the application without
> dmtcp_launch. The application runs fine with dmtcp_launch. I realize that
> this must be quite an old document since the function names are incorrect.
>
> Can I assume by your response that the ability to run with and without
> dmtcp_launch is no longer supported?
>
> Thanks again,
> Stu
>
>
> ----- Original Message -----
> From: "Rohan Garg" <rohg...@ccs.neu.edu>
> To: "Stu Whitman" <swhit...@groupw.com>
> Cc: "dmtcp-forum" <dmtcp-forum@lists.sourceforge.net>
> Sent: Monday, February 29, 2016 11:38:28 AM
> Subject: Re: [Dmtcp-forum] Running application without dmtcp_launch
>
> Hi Stu,
>
> For application-initiated checkpointing you need to do two things:
>
> a) compile your application with -fPIC; and
> b) run your application under dmtcp_launch.
>
> Please refer to the example in test/plugin/applic-intiated-ckpt/. Run a
> `make check` to execute the example. The example code is in: applic.c
> in the same directory.
>
> Hope this helps,
> Rohan
>
>> On Feb 29, 2016, at 11:13 AM, Stu Whitman <swhit...@groupw.com> wrote:
>>
>> Hello,
>>
>> I am trying to run my application without dmtcp_launch and use the function
>> dmtcp_is_enabled() to test if checkpointing is available. The information on
>> the website led me to believe I needed to compile the application with the
>> -fPIC option, which I have done. I am using version 2.3.1. When I run my
>> application I get the following message:
>>
>> dmtcpplugin.cpp:467 DMTCP Internal Error: Env var DMTCP_DLSYM_OFFSET not set.
>> Aborting.
>>
>> Is this still a supported feature, or is there something that I am not
>> understanding?
>>
>> Thanks,
>> -Stu
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