PIOSS-LB

A Parallel I/O and Storage System (PIOSS) simulation model for the analysis of spatial aspects of load balance in Parallel File Systems. PIOSS simulates a scenario with multiple processes generating write requests to a shared or multiple independent files into a Parallel File System. At the end of the simulation, the maximum number of bytes and the maximum number of files in a data server is returned.

Requirements

1. PIOSS is written in C, and, thus, requires a C compiler (C99 or higher);
2. The build system is CMake (version 2.8 or higher).

Build Instructions

1. Clone PIOSS repository to your local machine:

   git clone git@github.com:lapesd/pioss-lb.git
   

2. Create a build directory and the Makefile:

   mkdir build
   cd build
   ccmake ..
   

3. Make PIOSS:

   make
   

Running PIOSS

To run PIOSS, execute in the PIOSS build directory:

```
./pioss [options]
```

Options

--niop=NUM | -n NUM: number of I/O generating processes (default: 1)

--nbytes_per_iop=NUM | -b NUM: size (in bytes) of the contiguous block of data transferred by each I/O process (default: 1 MiB = 1048576)

--shared_file | -f: all I/O processes transfer data to a single shared file (default: each I/O process transfers to an independent file)

--ndts=NUM | -m NUM: number of data servers (default: 2)

--stripe_width=NUM | -w NUM: number of data servers per file; must be smaller or equal to --ndts (default: 1)

--stripe_size=NUM | -z NUM: size of a file stripe fragment (default: 64 KiB = 65536)

--lb_type=STR | -t STR: data server load balancer; currently two options are available: "RAND", and "RAND+SEQ" (default: RAND)

--lb_seed=NUM | -s NUM: seed for load balancer RNG (default: 0)

--output=STR | -o STR: append output statistics to the file (default: no output)

--debug | -d: print debug messages (default: false)

--help | -h: display command-line options

Remarks

PIOSS is a work-in-progress. Although it is not supposed to cause any damage to your system, use it at your own risk.