MIPS architecture

Jovan Stosic April 20, 2020

MIPS (Microprocessor without Interlocked Pipelined Stages) is a reduced instruction set computer (RISC) instruction set architecture (ISA) developed by MIPS Computer Systems, now MIPS Technologies, based in the United States.

There are multiple versions of MIPS: including MIPS I, II, III, IV, and V; as well as five releases of MIPS32/64 (for 32- and 64-bit implementations, respectively). The early MIPS architectures were 32-bit only; 64-bit versions were developed later. As of April 2017, the current version of MIPS is MIPS32/64 Release 6. MIPS32/64 primarily differs from MIPS I–V by defining the privileged kernel mode System Control Coprocessor in addition to the user mode architecture.

The MIPS architecture has several optional extensions. MIPS-3D which is a simple set of floating-point SIMD instructions dedicated to common 3D tasks, MDMX (MaDMaX) which is a more extensive integer SIMD instruction set using the 64-bit floating-point registers, MIPS16e which adds compression to the instruction stream to make programs take up less room, and MIPS MT, which adds multithreading capability.

Computer architecture courses in universities and technical schools often study the MIPS architecture. The architecture greatly influenced later RISC architectures such as Alpha.

https://en.m.wikipedia.org/wiki/MIPS_architecture

Aqua-Lung

Jovan Stosic April 18, 2020

Aqua-Lung was the first open-circuit, self-contained underwater breathing apparatus (or “scuba”) to reach worldwide popularity and commercial success. Aqua-Lung was the brand of air regulator, which could be attached to gas tanks. This class of regulator is now commonly referred to as a diving regulator, or demand valve. The Aqua-Lung was invented in France during the winter of 1942–1943 by two Frenchmen: the engineer Émile Gagnan and the Naval Lieutenant (French: “lieutenant de vaisseau”) Jacques Cousteau. It allowed Cousteau and Gagnan to film and explore more easily underwater.

https://en.m.wikipedia.org/wiki/Aqua-Lung

OpenLDAP N-Way MultiMaster Replication

Jovan Stosic April 16, 2020 
dn: olcDatabase={1}hdb,cn=config
changetype: modify
add: olcSuffix
olcSuffix: dc=test,dc=local
-
add: olcRootDN
olcRootDN: cn=admin,dc=test,dc=local
-
add: olcRootPW
olcRootPW: {SSHA}SGq737yNactRCyMY70TDTQs6V1wzMRD6
-
add: olcSyncRepl
olcSyncRepl: rid=004 provider=ldap://ldap1.test.local binddn="cn=admin,dc=test,dc=local" bindmethod=simple
  credentials=test searchbase="dc=test,dc=local" type=refreshOnly
  interval=00:00:00:10 retry="5 5 300 5" timeout=1
olcSyncRepl: rid=005 provider=ldap://ldap2.test.local binddn="cn=admin,dc=test,dc=local" bindmethod=simple
  credentials=test searchbase="dc=test,dc=local" type=refreshOnly
  interval=00:00:00:10 retry="5 5 300 5" timeout=1
olcSyncRepl: rid=006 provider=ldap://ldap3.test.local binddn="cn=admin,dc=test,dc=local" bindmethod=simple
  credentials=test searchbase="dc=test,dc=local" type=refreshOnly
  interval=00:00:00:10 retry="5 5 300 5" timeout=1
-
add: olcMirrorMode
olcMirrorMode: TRUE

Source: linuxlasse.net :: OpenLDAP N-Way MultiMaster Replication

Re: viewing cn=config

Jovan Stosic April 16, 2020 
How do I get to see the contents of cn=config?



There are two main methods that I know of and for both you have to be logged in as root. First:


  ~# slapcat -b cn=config




Slapd does not even have to be running. This command will dump the entire configuration, but you can also filter its output:


  ~# slapcat -b cn=config -a cn=config

This will show only the root object. However:

  ~# slapcat -b cn=config -a "(|(cn=config)(olcDatabase={1}hdb))"

This will show both the root object and the hdb database definition.

Second method:

  ~# ldapsearch -Y EXTERNAL -H ldapi:/// -b cn=config

Again, you can also filter the output:

  ~# ldapsearch -Y EXTERNAL -H ldapi:/// -b cn=config cn=config

  ~# ldapsearch -Y EXTERNAL -H ldapi:/// -b cn=config \
     "(|(cn=config)(olcDatabase={1}hdb))"


 


Source: Re: viewing cn=config