Xen devel - Dec 2012 - how to make xenalyze continuously reading from xentrace file ?

Hi There,

I''m a student at NYIT, New York and I have project on xen hypervisor.
Currently i''m working on xentrace and xenalyze to monitor the runstate
events. What i''m trying do now is:  While i''m capturing  by
xentrace I want
to display the result on the screen using xenalyze.  I tried to use loop in
the main function but I got errors and when I tried to solve these errors I
got more errors.

int main(int argc, char *argv[]) {
    /* Start with warn at stderr. */

    warn = stderr;

    argp_parse(&parser_def, argc, argv, 0, NULL, NULL);

    if (G.trace_file == NULL)
        exit(1);

    if ( (G.fd = open(G.trace_file, O_RDONLY|O_LARGEFILE)) < 0) {
        perror("open");
        error(ERR_SYSTEM, NULL);
    } else {
        struct stat64 s;
        fstat64(G.fd, &s);
        G.file_size = s.st_size;
    }

    if ( (G.mh = mread_init(G.fd)) == NULL )
        perror("mread");

    if (G.symbol_file != NULL)
        parse_symbol_file(G.symbol_file);

    if(opt.dump_all)
        warn = stdout;

for (int i=0;i<=1000;i++){
    init_pcpus();


    if(opt.progress)
        progress_init();

    process_records();

    if(opt.interval_mode)
        interval_tail();

    if(opt.summary)
        summary();

    if(opt.report_pcpu)
        report_pcpu();
sleep(2);

}
    if(opt.progress)
        progress_finish();

    return 0;
}


*Error: vcpu_next_update: FATAL: p->current not NULL! (d32768v0, runstate
running)*


How can I can make xenalyze to continuously read from xentrace output file ?


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On 08/12/12 06:02, M A wrote:
> Hi There,
>
> I''m a student at NYIT, New York and I have project on xen
hypervisor.
> Currently i''m working on xentrace and xenalyze to monitor the
runstate
> events. What i''m trying do now is:  While i''m capturing 
by xentrace I
> want to display the result on the screen using xenalyze.  I tried to use
> loop in the main function but I got errors and when I tried to solve
> these errors I got more errors.
>
> int main(int argc, char *argv[]) {
>      /* Start with warn at stderr. */
>
>      warn = stderr;
>
>      argp_parse(&parser_def, argc, argv, 0, NULL, NULL);
>
>      if (G.trace_file == NULL)
>          exit(1);
>
>      if ( (G.fd = open(G.trace_file, O_RDONLY|O_LARGEFILE)) < 0) {
>          perror("open");
>          error(ERR_SYSTEM, NULL);
>      } else {
>          struct stat64 s;
>          fstat64(G.fd, &s);
>          G.file_size = s.st_size;
>      }
>
>      if ( (G.mh = mread_init(G.fd)) == NULL )
>          perror("mread");
>
>      if (G.symbol_file != NULL)
>          parse_symbol_file(G.symbol_file);
>
>      if(opt.dump_all)
>          warn = stdout;
>
> for (int i=0;i<=1000;i++){
>      init_pcpus();
>
>
>      if(opt.progress)
>          progress_init();
>
>      process_records();
>
>      if(opt.interval_mode)
>          interval_tail();
>
>      if(opt.summary)
>          summary();
>
>      if(opt.report_pcpu)
>          report_pcpu();
> sleep(2);
>
> }
>      if(opt.progress)
>          progress_finish();
>
>      return 0;
> }
>
>
> *Error: vcpu_next_update: FATAL: p->current not NULL! (d32768v0,
> runstate running)*
>
>
> How can I can make xenalyze to continuously read from xentrace output file
?
(Adding xen-devel, since this is definitely a coding question)

So I take it what you''re doing is this:
1. Start xentrace:
  # xentrace -e all /tmp/foo.trace &
2. Running your "looping" xenalyze on it:
  # xenalyze -s /tmp/foo.trace

Is that correct?

I don''t know what your exact problem is here, but one problem
you''ll run
into eventually is that xenalyze expects a certain "finished" file 
format, but there''s nothing here to synchronize xenalyze reading the 
file with xentrace writing the file.  The result is that you''re bound
at
some point to read a file of which the end is only half-written.

In any case, what you''re doing here is functionally not really that 
different from just doing it in bash:
  # while xenalyze -s /tmp/foo.trace && sleep 2 ; true; done

  -George