#
# tuned configuration
#

[main]
summary=Optimize for HPC compute workloads
description=Configures virtual memory, CPU governors, and network settings for HPC compute workloads.
include=latency-performance

[vm]
# Most HPC application can take advantage of hugepages. Force them to on.
transparent_hugepages=always

[disk]
# Increase the readahead value to support large, contiguous, files.
readahead=>4096

[sysctl]
# Forces hugepages to be allocated on non-hotpluggable memory
vm.hugepages_treat_as_movable=0

# Keep a reasonable amount of memory free to support large mem requests
vm.min_free_kbytes=135168

# Most HPC applications are NUMA aware. Enabling zone reclaim ensures
# memory is reclaimed and reallocated from local pages. Disabling
# automatic NUMA balancing prevents unwanted memory unmapping.
vm.zone_reclaim_mode=1
kernel.numa_balancing=0

# Busy polling helps reduce latency in the network receive path
# by allowing socket layer code to poll the receive queue of a
# network device, and disabling network interrupts.
# busy_read value greater than 0 enables busy polling. Recommended
# net.core.busy_read value is 50.
# busy_poll value greater than 0 enables polling globally. 
# Recommended net.core.busy_poll value is 50 
net.core.busy_read=50
net.core.busy_poll=50

# TCP fast open reduces network latency by enabling data exchange
# during the sender's initial TCP SYN. The value 3 enables fast open
# on client and server connections.
net.ipv4.tcp_fastopen=3