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Using netstat and dropwatch to observe packet loss on Linux servers Anyone that is running a modern Operating System is most likely utilizing TCP/IP to send and receive data. Modern TCP/IP stacks are somewhat complex and have a slew of tunables to control their behavior. The choice of when and when not to tune is not always super clear cut, since documentation and the advice of various network “ex
Debugging Java performance problems Ryan Matteson [email protected] http://prefetch.net Overview • Tonight I am going to discuss Java performance, and how opensource tools can be used to debug performance problems on production servers • I plan to split my 60-minutes into three parts: – Part 1 will provide an overview of the tools – Part 2 will show these tools in action – Part 3 will be a Q&A per
When an executable is run that relies on shared libraries not defined in the global search path, an error similar to the following is displayed: $ curl ld.so.1: curl: fatal: libgcc_s.so.1: open failed: No such file or directory Killed Typically this problem is fixed by running ldd(1) on the executable, locating the missing shared libraries, and adding one or more directories to the LD_LIBRARY_PATH
Proactively Handling Certificate Expiration With ssl-cert-check Digital certificates have become an essential part of Internet commerce, and are widely used to verify the identity of clients and servers. All digital certificates contain an expiration date which most client and server applications will check before using the certificates contents. If a client or server application detects that a ce
DTrace is a comprehensive and flexible dynamic tracing facility built into the Solaris, FreeBSD and OS X Operating System. DTrace allows dynamic instrumentation of a running system, which can assist with answering questions like “which process is chewing up CPU 38,” or “which user is causing the cross-call activity on CPU 6,” or “which setuid binaries are being executed?” DTrace uses a scripting l
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