MTool: Performance Monitoring for Multi-platform Systems
The daemon mtoold is written in ANSI C and is platform-dependent. With Linux we use the /proc file system for CPU, memory and network information. Sun and HP do not provide such an elegant approach; on these platforms we have to use /dev/kmem files.
We have defined a protocol for socket communication. Information is transferred as an ASCII stream concatenated from reserved words such as GRAPH, VALUE, disk, user, process etc. and specific values separated with the character | as a delimiter. In this way, we can add a new observed parameter without difficulty. A sample stream looks like this:
GRAPH|LOAD_avg1|0.06|GRAPH|LOAD_avg2|0.12|GRAPH| LOAD_avg3|0.22|GRAPH|CPU_user|1.00|GRAPH|CPU_nice| 0.00|GRAPH|CPU_system|0.00|GRAPH|CPU_idle|99.00| VALUE|MEM_real|14652K|VALUE|MEM_free|252K|VALUE| MEM_swap|33260K|VALUE|MEM_swap_free|31620K|
At this time, it is possible to intercept data transferred over the network; therefore, we are preparing Java encryption classes to enable secure data transfer. We are currently evaluating the DES and RSA algorithms. RSA would serve for key exchange (public and private) while DES, which is faster, would serve for the data transfer.
mtoold uses one simple configuration file which holds the names of the processes to be monitored. If this file is empty, information about all processes currently running on a monitored computer are transferred over the socket communication line.
Actually, at this time, we are not finished. The current version of MTool is just an intermediate step towards a more sophisticated and usable tool; however, it still provides a comfortable way of system monitoring. If we are authorized, we can monitor selected systems from any place in the world—a Java-capable browser is the only necessity. MTool is a small, powerful tool with many benefits. While using Linux as a development environment was a good choice, we would still like to appeal to the (non)commercial software companies to provide more Java development tools under Linux. Linux and Java together represent a competitive, reliable and cheap development system.
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