Template:ProgrammersResorces

Programmētāja resursi

• Noderīgas Linux komandas
• Bash by Example @ibm/developerworks
• Intro to Linux kernel

• Programming in C: A Tutorial (by Brian W. Kernighan)
• GCC and make - par gcc kompilatoru no NTU
• Gnu make dokumentācija
• makefile vai Makefile?
• Tipiskas unix direktoriju hierarhijas īss apraksts.

• Sockets:
  • Programming IP Sockets on Linux (tutorial @ gnosis.cx)
  • Sockets Tutorial @ Linux Howtos
  • Berkeley sockets (Wikipēdija)

• http://www.hiraeth.com/alan/tutorials/courses/unixprog.html
• http://lkml.org/
• The Linux Kernel Module Programming Guide

• Mutex tutorial and example

Programmēšanas analīzes rīki

• PMD - scans source code and looks for bugs, dead code, suboptimal code, overcomplicated expressions, duplicate code.

Linux veiktspējas analīze

• Top 20 Linux monitoring tools @cyberciti
• 20 rīki Linux veikstpējas monitoringam (IPTraf u.c.) @tecmint
• CPU analīze
• Disku I/O analīze
• IO profiling at Linux programming blog
• Tīkla analīze
  • Tīkla caurplūdes testi

$ yes | pv | ssh user@example.com "cat > /dev/null"
     97,3MiB 0:01:36 [1,28MiB/s][         <=>    ]

$ mtr -rw -c 100  <server_ip>
     HOST: <myhost>     Loss%   Snt   Last   Avg  Best  Wrst StDev
     1.|-- _gateway      0.0%   100    0.7   0.6   0.3   2.4   0.2
     2.|-- <server_ip>   1.0%   100    1.0   4.3   0.9  26.6   5.7

$ iperf3 -s    # startē serveri vienā galā
     Server listening on 5201
$ iperf3 -c <server_ip>    # startē klientu otrā galā
     Connecting to host <server_ip>, port 5201
     [  5] local 192.168.1.123 port 51846 connected to <server_ip> port 5201
     [ ID] Interval           Transfer     Bitrate         Retr  Cwnd
     [  5]   0.00-1.00   sec  1.42 MBytes  11.9 Mbits/sec    0   89.1 KBytes       
     [  5]   1.00-2.00   sec  1.62 MBytes  13.6 Mbits/sec    0    147 KBytes       
     ...
     [  5]   9.00-10.00  sec  2.30 MBytes  19.3 Mbits/sec    0    595 KBytes       
     - - - - - - - - - - - - - - - - - - - - - - - - -
     [ ID] Interval           Transfer     Bitrate         Retr
     [  5]   0.00-10.00  sec  14.2 MBytes  11.9 Mbits/sec    0             sender
     [  5]   0.00-10.42  sec  11.6 MBytes  9.36 Mbits/sec                  receiver

$ nstat -az | grep -Ei "drop|overflow|retrans"
     TcpRetransSegs                  127923             0.0
     TcpExtLockDroppedIcmps          0                  0.0
     TcpExtListenDrops               1                  0.0
     TcpExtTCPLostRetransmit         11837              0.0
     ...

$ ethtool eth0
     Settings for eth0:
     Supported ports: [ TP ]
     Supported link modes:   10baseT/Half 10baseT/Full
                       100baseT/Half 100baseT/Full
                       1000baseT/Full
     ...

$ sudo ethtool -S eth0 | grep -E "errors|dropped|fifo|collision"
     collisions: 0
     rx_crc_errors: 0
     rx_missed_errors: 0
     tx_aborted_errors: 0
     tx_carrier_errors: 0
     ...

• "bashtop" rīks veiktspējas analīzei

Āķīgi uzdevumi un pieredze

• C/C++ Tricky Programs
• Computers are exact, precise, and logical machines, until they aren’t.
• Advent of Code

Atziņas

• Teach yourself programming in 10 years by Peter Norvig
• Code review: Learn how NASA codes (blog), and Mars Code (ACM article)
• Things Every Hacker Once Knew
• Kāpēc CR+LF? - Par to kāpēc vēsturisku iemeslu dēļ Windows sistēmās teksta rindas beigās ir CR+LF, kamēr Unix sistēmā tikai LF
• Linux Timeline - Linux distributīvu vēstures diagramma.

• Linus ar Linus par Linux un ne tikai, kamēr būvē datoru priekš Linus (2025).

• Linux Distribution Timeline (2024) - liels attēls ar Linux distributīvu savstarpējo saikni un vēsturi.