Free valgrind software for linux

Callgrind uses runtime instrumentation via the Valgrind framework for its cache simulation and call-graph generation. This way, even shared libraries and dynamically opened plugins can be profiled.

The data files generated by Callgrind can be loaded into KCachegrind for browsing the performance results. But there is also a command line tool in the package to get ASCII reports from data files without the need to use KCachegrind.

The format of Callgrind output is documented here. With conversion scripts, KCachegrind is able to visualize output of other profilers like OProfile, a system-wide profiler for Linux using statistical sampling with hardware performance counters. There also exist converters for profiling output of Python, PHP and PERL.

MTasker is a two-file C++ library designed to support very simple cooperative multitasking. MTasker can facilitate writing code that would ordinarily require a state machine, for which the author does not consider himself smart enough.
This class does not perform any magic it only makes calls to makecontext() and swapcontext(). Getting the details right however is complicated and MTasker does that for you.
If preemptive multitasking or more advanced concepts such as semaphores, locks or mutexes are required, the use of POSIX threads is advised.
MTasker is designed to offer the performance of statemachines while maintaining simple thread semantics. It is not a replacement for a full threading system.
Enhancements:
- A theoretically damaging bug was fixed involving delete[] vs delete, spotted by Valgrind.
- There is tentative Solaris support, not heavily tested.
- Furthermore, a new method called numProcesses() was added so the kernel can query how many processes are running, and perhaps acting on that.

Eigen project is a lightweight C++ template library for vector and matrix math, a.k.a. linear algebra.
Unlike most other linear algebra libraries, Eigen focuses on the simple mathematical needs of applications: games and other OpenGL apps, spreadsheets and other office apps, etc. Eigen is dedicated to providing optimal speed with GCC.
- Its fixed-size classes are specially optimized for small sizes up to 4, although it is theoretically possible to specialize them to any size. They never cause dynamic memory applications and the simple operations on them are as fast as is possible at least for sizes up to 4 (see below).
- Its dynamic-size classes are more flexible and suitable for larger sizes.
Main features:
- No dependency. Only relies on the C++ Standard Library, and only does so for a few things.
- As a consequence: very good portability.
- Very good performance (tested with GCC, should apply to other compilers as well):
- The fixed-size classes are optimal in the sense that theyre just plain C arrays with methods manipulating them. They never cause dynamic memory allocations. Checked with valgrind.
- The assembly code generated by GCC has been carefully checked to make sure that loop unrolling and function inlining work as expected with "g++ -O2" and "g++ -O3".
- For the loops that GCC fails to unroll (mostly nested loops), we provide hand-unrolled versions for sizes up to 4.
- There is no "virtual" keyword in Eigen.
- Eigen never trades performance for syntactic sugar. When some method introduces a significant language overhead (e.g. returns an object by value), we provide an alternative method doing the same thing faster but without the syntactic sugar.
- Provides easy-to-use classes for solving systems of linear equations.
- Provides easy-to-use functions for linear regression analysis.
- Can perform LU decompositions and use them to invert matrices, compute rank, kernel, etc.
- Integrates nicely with OpenGL:
- Provides functions and classes for projective geometry.
- Stores matrices in column-dominant order, hence matrices can be directly passed between OpenGL and Eigen.
- Uses an OpenGL-like typedef naming scheme, for instance Vector3f for vectors of floats of size 3.
- Robust:
- Only uses algorithms that are guaranteed to work in all cases. For example, the LU decomposition is done with complete pivoting, which means that it works for all square matrices, even singular ones.
- Covered by extensive unit-tests.
- Thread-safe, though thats only as a consequence of staying simple and not trying to do advanced stuff like buffer sharing.
- Floating-point-correct. Eigen has a clear, simple and sound policy with respect to the inherent problems of IEEE754 floating-point arithmetic.
- Fully supports std::complex for matrices and vectors over the complex numbers.
- Is a pure template library and consists only of header files. Thus, using Eigen will only add a build-time dependency to your project.
- Uses standard asserts, controlled as usual by NDEBUG. To achieve optimal performance, turn them off by defining NDEBUG, e.g.
Enhancements:
- This release supports fixed-size classes that are optimized for small sizes of up to four dimensions for 3D geometry and OpenGL.
- Dynamic classes are more flexible and suitable for larger data.

Alleyoop is a GNOME front-end to the popular Valgrind memory debugger.

Alleyoop is a graphical front-end to the increasingly popular Valgrind memory checker for x86 GNU/ Linux using the Gtk+ widget set and other GNOME libraries for the X-Windows environment.

Features include a right-click context menu to intelligently suppress errors or launch an editor on the source file/jumping to the exact line of the error condition. A searchbar at the top of the viewer can be used to limit the viewable errors to those that match the regex criteria entered. Also included is a fully functional Suppressions editor.

KernelKit is a Knoppix GNU/Linux derivative targetting the development of Linux kernel and drivers, as well as Free Sofware embedded systems. It is currently being used in our Embedded Linux Training sessions.
Differences with standard Knoppix GNU/Linux:
- Removed applications not related to Linux kernel, drivers and embedded systems: games, office applications...
- Added tools and libraries for kernel and software development, in particular cross-compiling toolchains for many different architectures
Usefulness
- Embedded Linux trainings: provide all the needed tools in a tested configuration. No need to install a GNU/Linux distribution. No need to check installed package versions prerequisites.
- Embedded Linux demonstration: helps to discover, try and demonstrate useful tools in this technical area.
- Kernel, driver and embedded application development: toolkit to get the job done quickly and efficiently. Useful for support people away from their regular desktop, or for people who are not allowed to install software by themselves.
Cross-compiling toolchains
- uClibc toolchains: cross-compiling toolchains for the following architectures: arm, i386, ppc, m68k, mips, mipsel
Development
- ccache: a C/C++ compiler cache. Can save a lot of time when you compile the kernel over and over again.
- doxygen: a documentation system.
- SCons: a Software construction tool. A strong alternative to autoconf / automake / make.
- Splint: static C code checker.
Cross-compiling toolchains
- uClibc toolchains: cross-compiling toolchains for the following architectures: arm, i386, ppc, m68k, mips, mipsel
Kernel development
- git: the new kernel source management system.
- cogito: a git front-end.
Emulation
- QEMU: a cpu and system emulator for several platforms. Great to experiment with i386 or ppc embedded systems.
- SkyEye. An emulator for several popular ARM boards.
Performance analysis
- Linux Trace Toolkit": user space tools for analyzing system performance. Note that you can only analyse results so far, and not produce data, as the current KernelKit kernel doesnt have support yet for LTT.
- Valgrind: memory debugger and performance analysis tool for x86 Linux.
Lightweight applications for embedded systems
- Dillo: a very light and fast web browser.
- e3: a microscopic editor supporting several interface types (vi, emacs...).
Unix learning help
- fish: the Friendly Interactive SHell makes it much easier to use the Unix command line. The best way to start for beginners (Caution:: strangely broken in the latest KernelKit release)
- vimtutor: part of the vim package. Very nice way to learn vi in 30 minutes!
Misc
- gkermit: a serial communication utility.
- Psyco: a kind of Just In Time compiler for Python. Useful for running the BitBake / OpenEmbedded tool faster.
- xvncviewer: a VNC client. Sometimes useful to display target graphics on the host system.
Enhancements:
- This release adds the texinfo 4.8.dfsg.1-4 package (needed to run buildroot).

CryptNET Keyserver is an effort to develop an openPGP (RFC2440) compliant public keys server which is licensed under the terms of the GNU GPL.
It is written in C, and runs on Linux. It uses PostgreSQL for key storage, and supports the hkp protocol (it can interface with GnuPG and NAI PGP). The keyserver is mostly functional, and there is a link to a running copy on the homepage.
Main features:
- openPGP (RFC2440) compatible (version 3 and version 4 packets)
- Validate keys packets and subpackets
- Tied to free RDBMS (postgreSQL)
- Interface with programs through standard keyserver interface
- Capable of updating previously stored keys
- Key caching
- Fully multi-threaded
- Fully (cryptographically) validate signatures
- Handle signature expiration
- Handle key expiration and revocation
- Allow users to submit and retrieve keys through web browser
- Allow users to submit and retrieve multiple keys as key ring through web browser
- Synchronize with other keyservers through HTTP protocol (PKS)
Enhancements:
- Feature Request Completed: [ 1000332 ] sigalm to prevent cpu throttle (vab)
- Feature Request Completed: [ 1192629 ] (Optional) Large File Support (vab)
- Fixed Bug: [ 999662 ] Legacy gcc compatibility (pacoje)
- Fixed Bug: [ 999656 ] tcpwrappers problems in-addr.arpa (pacoje)
- Fixed Bug: [ 999925 ] cks import problems (vab)
- Fixed Bug: [ 969089 ] cks_import skips last pubkey in keyring (vab)
- Fixed Bug: [ 999676 ] cks import problems (vab)
- Fixed Bug: [ 966767 ] cks_import race condition on import error (vab)
- Fixed Bug: [ 969739 ] Valgrind: parse_attribute_sub_packets (vab)
- Fixed Bug: [ 969734 ] Valgrind: Memory Violation (vab)
- A context was created to handle state information (vab)
- sql updates (tab vs. spaces bug in formatting of cks.sql.in) (vab)
- General code clean-up (Function Signature Changes) (vab)
- cks_install.pl removed (Integrated into Autoconf/Automake) (vab)
- Fixes to correct most -Wall warnings (vab)
- Fix for memory leak in parse.c (vab)
- Code to force cksd to exit if it is running with root privileges (vab)
- cksd.init rewritten (vab)
- Support of storage of pid in /var/run for init system usage (vab)
- CGI processing code clean-up (vab)
- Creation of etc dir in project root w/ separate Makefile (vab)
- Clean-up of HTML pages (vab)
- Removal of db2 hooks - no longer have access to the software (vab)
- Removal of some out dated documentation (vab)
- Fix for potential read_line race condition (vab)
- Default user for keyserver changed to "cks" (vab)
- Default user for webserver changed to "apache" for Gentoo (vab)
- New hook HTML page for Web Of Trust Information (vab)
- HTML Layout bug fix in keys.c print_uid: echo_signatures (vab)
- SIGPIPE in now ignored. SIGTERM and SIGHUP are now caught (vab)

SIPp is a free Open Source test tool / traffic generator for the SIP protocol. It includes a few basic SipStone user agent scenarios (UAC and UAS) and establishes and releases multiple calls with the INVITE and BYE methods.
SIPp project can also reads custom XML scenario files describing from very simple to complex call flows. It features the dynamic display of statistics about running tests (call rate, round trip delay, and message statistics), periodic CSV statistics dumps, TCP and UDP over multiple sockets or multiplexed with retransmission management and dynamically adjustable call rates.
Other advanced features include support of IPv6, TLS, SIP authentication, conditional scenarios, UDP retransmissions, error robustness (call timeout, protocol defense), call specific variable, Posix regular expression to extract and re-inject any protocol fields, custom actions (log, system command exec, call stop) on message receive, field injection from external CSV file to emulate live users.
While optimized for traffic, stress and performance testing, SIPp can be used to run one single call and exit, providing a passed/failed verdict.
Last, but not least, SIPp has a comprehensive documentation available both in HTML and PDF format.
SIPp can be used to test many real SIP equipements like SIP proxies, B2BUAs, SIP media servers, SIP/x gateways, SIP PBX, ... It is also very useful to emulate thousands of user agents calling your SIP system.
Enhancements:
- New: Statistical (conditional) branching feature. See
- http://sipp.sf.net/doc/reference.html#Randomness+in+conditional+branching.
- New: 3PCC extended mode - see
- http://sipp.sourceforge.net/doc/reference.html#3PCC+Extended
- Tool: monitor remote SIP servers through SNMP - see
- http://sipp.sourceforge.net/wiki/index.php/Getting_feedback_from_the_server
- Enh: extends the -aa option to UPDATE messages
- Enh: changes in the compilation with external libs - useful for the package
- generation system
- Enh: Allow sampling from a Weibull distribution for pause duration
- Enh: use stat_delimiter for the trace_rtt option and include number that is
- being reported.
- Enh: Add repeat_rtd keyword for repeated RTD calculations
- Enh: Handle stripping Control-M characters from multi-valued headers in
- get_header
- Enh: Update the clock_tick more frequently so that we have a higher timer and
- statistics resolution
- Enh: for option that take a time as argument - allow them to be specified using
- seconds or milliseconds
- Enh: fail when parsing a scenario that has pcap if pcap is not enabled
- Enh: print the actual location of the error log file and the error condition
- (if any) on creation
- Enh: fail when parsing a scenario that enables authentication if SSL is not
- enabled
- Enh: Makefile - include EXTRAENDLIBS keyword so that libraries can be appended
- to the list after SSL Enh: Add regexp_match argument to the receive command for
- universal catching
- Enh: remote control: increase the allowed number of control sockets.
- Enh: 3pcc extended: clean the reach of the allowed number of local twin sockets
- Enh: amelioration of statistic computing
- Enh regexp: add case_indep, occurence and start_line options for the hdr
- matching case
- Enh: Stats: Use RTDs that are precise to the microsecond in -trace_rtt, and
- improve the consistency between trace_rtt and the averages
- Enh: Only include RTDs that are actually used in the CSV output
- Enh: Allow loss percentages less than 1 and also a global command line option to
- specify that packets should be lost at a given percentage
- Fix: fix for -t un error for non-IPv6 platform like win32 - Unable to bind UDP
- socket, errno = 106 (Address family not supported by protocol)
- Fix: Do not initialize the screen library in background mode
- Fix: allow having an optional recv before a recvCmd
- Fix: Authentication: allow [fieldn] values for the [authentication] field
- Fix: updated support of short header forms
- Fix: small bug fix to the micrortt.diff which is required for the initial call
- rate to work properly
- Fix:Allow the code to compile with -Wall -Werror on Linux
- Fix: empty line was generated when [routes] keyword was used and proxy did not
- record-route
- Fix: pcap on HPUX; Fix: Simple fixes identified with valgrind
- Fix: 3pcc extended: problem when quitting
- Fix: regexp: add a warning when the specified header is not present in the
- received message
- Fix: pcap: destroy the send packets thread properly even if the sendto failed
- Fix: bug in regexp due to an incomplete commit (rev 172) - remove some debugging
- traces in message log file
- Fix: bugs on retransmission counters and on cookies for optional messages
- Fix: Incorrect branch in automatic ACK answering to unexpected >= 400 responses,
- as well as automatic CANCEL - in such cases, branch must be identical to the
- branch of the initial INVITE request
- Fix: 3pcc extended: clean up when screen exit. Fix: stop logging when the
- maximum allowed file size is reached (avoid core dump)
- Fix: incomplete Via header in automatic responses when aborting calls
- Fix: -h: -key parameter
- Fix: 3pcc/3pcc extended modes: closes twin sockets properly when twin instance
- exits, to break the poll() loop and avoid the print of empty messages
- Fix: in 3pcc/3pcc extended modes: send BYE/CANCEL before exit due to other twin
- instance exit
- Fix: force exit when pressing q twice (Q press can still be used)
- Fix: Aka authentication for synchro case, also added password len as password
- for authentication might contain char Fix: possible core dump in SDP parser
- Fix: accept up to the 5 defined RTDs (previously would only accept one less)
- Fix: Fail if there is an invalid repartition table specification - previous
- behavior was a core dump
- Fix: added -users option to the parameter table
- Fix: change option description to match timed options
- Fix: trace_err did not work in background mode
- Fix: bug when testing the presence of the 3PCC compilation flag
- Fix: bug in -r -rp option