Debugging
Logs / Print Statements
A typical debugging technique is to make use of prints and/or logging entries. This is no more than adding debug lines in the preferred programming language:
| Code Block |
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| language | cpp |
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| title | C++ Print / Logging |
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| linenumbers | true |
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|
printf("A log message: %d - %s\n", num, msg);
std::cout << "A log message: " << num << " - " << msg << std::endl;
ACS_SHORT_LOG((LM_INFO, "A log message %d - %s", num, msg)); |
| Code Block |
|---|
| language | java |
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| title | Java Print / Logging |
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| linenumbers | true |
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System.out.println("A log message: " + num +" - " + msg);
m_logger.info("A log message: " + num +" - " + msg); |
| Code Block |
|---|
| language | cpp |
|---|
| title | C++ Print / Logging |
|---|
| linenumbers | true |
|---|
|
print("A log message: %d - %s\n" % (num, msg))
print("A log message: " + str(num) + " - " + msg)
print("A log message: ", num, msg)
logger.logInfo("A log message: %d - %s" % (num, msg)
logger.logInfo("A log message: " + str(num) + " - " + msg) |
C++
GDB
A more advanced debugging technique is the use of gdb. The use is the same as with a normal process; it could be used with a core dump, attaching to a running (client/container) process or start your client/container with appropriate parameters.
| Code Block |
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| language | bash |
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| title | Opening a core dump with GDB |
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> gdb maciContainer core.gas03.maciContainer.31215
#Or
gdb -c core.gas03.maciContainer.31215 maciContainer |
| Code Block |
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| language | bash |
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| title | Attaching to a running process |
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|
> ps aux |grep maciContainer
almamgr 106852 1.8 0.2 1159516 43512 pts/2 Sl+ 01:09 0:00 maciContainer bilboContainer -ORBEndpoint iiop://127.0.1.1:4002 -m corbaloc::127.0.1.1:3000/Manager
> gdb -p 106852
#Or
> gdb -p $(ps aux |grep maciContainer | grep bilboContainer | awk '{print $2}') |
| Code Block |
|---|
| language | bash |
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| title | Start a container in GDB |
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#It is usually better to inspect the parameters used by the container started by ACS / ACS Daemons
> ps aux |grep maciContainer |grep bilboContainer
almamgr 106852 1.8 0.2 1159516 43512 pts/2 Sl+ 01:09 0:00 maciContainer bilboContainer -ORBEndpoint iiop://127.0.1.1:4002 -m corbaloc::127.0.1.1:3000/Manager
# We then simply copy the part starting from maciContainer:
>gdb --args maciContainer bilboContainer -ORBEndpoint iiop://127.0.1.1:4002 -m corbaloc::127.0.1.1:3000/Manager
(gdb) r
|
Valgrind
