Avitohol – Bulgarian multifunctional high performance    computing cluster


The Supercomputer System Avitohol at IICT-BAS consists of 150 HP Cluster Platform SL250S GEN8 servers, each one equipped with 2 Intel Xeon E5-2650 v2 8C 2600 GHz CPUs and two Intel Xeon Phi 7120P co-processors. Six management nodes control the cluster, with 4 of them dedicated to the provision of access to the storage system through Fibre Channel. The storage system is HP MSA 2040 SAN with a total of 96 TB of raw disk storage capacity. All the servers are interconnected with fully non-blocking FDR Infiniband, using a fat-tree topology. The HP CMU is used for fabric management, together with the torque/Moab combination for local resource management. Most of the computing capacity of the system comes from the Intel Xeon Phi 7120P co-processors, which use the Multiple Integrated Core (MIC) technology. For optimum use of these resources Intel compilers and the Intel MKL are deployed. Since this supercomputer is relatively new, it is in the process of deploying the software and libraries and streamlining the computational environment. Other technical information is provided in the table below.

Administrative data

Name Avitohol
Short Description Bulgarian multifunctional high performance computing cluster
Country Bulgaria


Dedication to VI-SEEM

CPU (percent) 10%
Storage (percent) 5%
Accelerators (percent) 10%
CPU (core-hours per year) 2,102,400
Storage in TB 5
Accelerators (hours per year) 16,030,800


System operational since Jun 2015
Available to the project from PM04
Expected date to be phased -
Interfaces SSH, gridFTP


Computational Power

Number of servers 150 Interconnect type FDR InfiniBand Peak performance (Tflops) 412
Server specification HP Proliant SL250s Gen8 Interconnect latency 1.1 μs Real performance (Tflops) 264
CPU per server 2 Interconnect bandwidth 56 Gbps Operating system Red Hat Enterprise Linux for HPC Compute Node
RAM per server 64 GB Local filesystem type Lustre Version 6.7 (Santiago)
Total number of CPU-cores 2,400 Total storage (TB) 96 TB Batch system/scheduler Torque/Moab
Max number of parallel processes 4,800 Peak performance CPU (Tflops) 50 Accelerators type Intel Xeon Phi 7120P
Number of cores 61 Servers equipped with accelerators 150 Peak performance accelerators (Tflops) 362
Accelerators per server 2
Development tools Intel Compilers (C/C++, FORTRAN), GNU Compilers, OpenMPI, CUDA, TotalView, Scalasca, TAU, gprof, gdb, pgdbg, Program Database Toolkit
Libraries Intel MKL, HDF5, FFTW, NetCDF, GSL, LAPACK Boost, BLAS
Applications Gromacs, NAMD, Desmond, VMD