03-01-2018
This is my personal feeling: It is well known that any dedicated compiled program, be it C, C++, Pascal, or other, usually benefit from increased execution speed compared to e.g. scripts. But there is a tradeoff in terms of flexibility vs. e.g. awk, perl esp. when it comes to text analysis and processing, and adapting / modelling algorithms, for which those were specifically targeted / designed.
I'd be very interested in any results comparing execution times of your C++ with an equivalent awk script, as they both will use the same regex system calls.
Last edited by RudiC; 03-01-2018 at 04:57 AM..
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LEARN ABOUT CENTOS
error::buildid
ERROR::BUILDID(7stap) ERROR::BUILDID(7stap)
NAME
error::buildid - build-id verification failures
DESCRIPTION
Because systemtap's script translation / execution stages may be executed at different times and places, it is sometimes necessary to ver-
ify certain invariants. One such invariant is that if a script was informed by translate-time analysis of executables, then those same
executables need to be used at run time. This checking is done based upon the build-id, a binary hash that modern (post-2007) compil-
ers/toolchains add as an NT_GNU_BUILD_ID ELF note to object files and executables. Use the readelf -n command to examine the build-ids of
binaries, if you are interested.
Only scripts are sensitive to executables' build-ids: generally those that perform deep analysis of the binaries or their debuginfo. For
example, scripts that place .function or .statement probes, or use stack backtrace-related tapset functions may be sensitive. Other
scripts that rely only on process.mark or kernel.trace probes do not require debuginfo. See the DWARF DEBUGINFO section in the stap-
probes(3stap) man page.
During translation, systemtap saves a copy of the relevant files' build-ids within the compiled modules. At run-time, the modules compare
the saved ones to the actual run-time build-ids in memory. The error message indicates that they did not match, so the module will decline
placing a probe that was computed based upon obsolete data. This is important for safety, as placing them at an inappropriate address
could crash the programs. However, this is not necessarily a fatal error, since probes unrelated to the mismatching binaries may operate.
A build-id mismatch could be caused by a few different situations. The main one is where the executable versions or architecture were dif-
ferent between the systemtap translation and execution times/places. For example, one may run a stap-server on a slightly different ver-
sion of the OS distribution. The kernel running on the workstation may be slightly different from the version being targeted - perhaps due
to a pending kernel upgrade leaving different files on disk versus running in memory. If your OS distribution uses separate debuginfo
packages, the split .IR .debug files may not exactly match the main binaries.
SEE ALSO
http://fedoraproject.org/wiki/Releases/FeatureBuildId,
stap(1),
stapprobes(3stap),
warning::debuginfo(7stap),
error::reporting(7stap)
ERROR::BUILDID(7stap)