On 12/10/2015 09:39, Sindhu S. (sins) wrote: > > Hi all, > > We are planning to run on openwrt router(Embedded device) and trying > to understand the memory requirement. > > I would like to know, what?s the run time memory ,peak memory . > > Please let me know ,if there is any documentation, tool , or > command to do the same. > Because OpenSSL is a library, the memory requirement depends a lot on whatever it is used for. For example, if OpenSSL is used for the https web user interface, some of the memory will be allocated for each simultaneous connections from the web browser(s) to the router. If OpenSSL in a server is used for client certificate validation (logging in with user certificates), there should be additional memory used for every trusted CA certificate in the configuration (because they all need to be sent to the other end as part of the request for user authentication). If OpenSSL is used in an SSL client (such as curl or wget), and the trusted CA certificates are stored in the flash file system using the "hashed symlinks" technique, there will usually only be a need to load the actually used CA certificate into memory, while the alternative of putting all the trusted CA certificates in a single file requires them all to be loaded into memory. When using the openssl command line tool, the amount of memory used depends heavily on the command and data specified. In the end, there is no substitute for measuring the actual process memory usage during the actual intended load scenarios. For long running processes (such as the http server process), this can be done by simply reading the various files under /proc/<pid>/ and comparing different uses and configurations. For short running processes (such as wget, curl or the openssl command line tool), there is probably some generic UNIX/Linux command to report this, similar to how the "time" command can measure execution time. > Below are the details of kernel version and openssl version. > > 519 => openssl version > > OpenSSL 1.0.1f 6 Jan 2014 > (Pretty old, there have been lots of security fixes since then). > 521 => uname -a > > Linux snbi-tb-c 3.13.0-24-generic #46-Ubuntu SMP Thu Apr 10 19:11:08 > UTC 2014 x86_64 x86_64 x86_64 GNU/Linux > Hmm, that looks like a desktop, most OpenWrt installs are on MIPS or ARM, though I have seen it on low end x86 too (such as Geode and Via CPUs). P.S. On most existing OpenWrt installs, there is actually plenty of RAM, but a shortage of flash storage space, though exceptions have occurred. Enjoy Jakob -- Jakob Bohm, CIO, Partner, WiseMo A/S. http://www.wisemo.com Transformervej 29, 2860 S?borg, Denmark. Direct +45 31 13 16 10 This public discussion message is non-binding and may contain errors. WiseMo - Remote Service Management for PCs, Phones and Embedded
