Added enabling swap and investigating dmesg, changed method for detecting logical CPUs, added info about tests.

README.md

@@ -1,6 +1,6 @@
 # R distributed computing
 
-In this repository I show a practical solution to massive distributed computing in R. I have successfully tested this approach in my research with ~200 remote hosts and ~800 remote connections. Brief examples concern [caret](https://topepo.github.io/caret/) package for creating predictive models and [foreach](https://cran.r-project.org/web/packages/doParallel/index.html) loop for more general parallel computing. 
+In this repository I show a practical solution to massive distributed computing in R. I have successfully tested this approach in my research with ~200 remote hosts (and ~800 remote connections) on computers located in [Faculty of Mathematics and Computer Science, Adam Mickiewicz University in Poznań](https://translate.google.com/translate?hl=pl&sl=pl&tl=en&u=https://laboratoria.wmi.amu.edu.pl/Laboratoria). Brief examples concern [caret](https://topepo.github.io/caret/) package for creating predictive models and [foreach](https://cran.r-project.org/web/packages/doParallel/index.html) loop for more general parallel computing. 
 
 The solution is based on:
  * [Microsoft R Open](http://mran.microsoft.com/), 
@@ -88,6 +88,7 @@ The `configure_hosts` is a short name for basic execution order:
  1. `generate_ssh_keys` - generates ssh keys to communicate with hosts (see `SSH_*` variables),
  1. `hosts_push_ssh_key` - pushes the keys to hosts and disables password authentication,
  1. `hosts_push_shell_script` - pushes the bash script to hosts,
+ 1. `hosts_enable_swap` - enables on hosts swap defined in `SWAP_PART`,
  1. `dump_project_r_files` - gathers all R project files used in the project,
  1. `dump_r_libraries` - gathers all R libraries in `~/.checkpoint` directory,
  1. `hosts_push_project_r_files` - pushes gathered R project files to hosts,
@@ -106,7 +107,7 @@ If you want to make only one connection per node (regardless number of cores), y
 
 Alternatively, instead of installing soft on [WMI rescue](http://rescue.wmi.amu.edu.pl), you can create and boot on hosts your own customized distro.
 
-You can investigate hosts install logs through `hosts_check_install_log_*` functions. You can also check and clean remote worker logs through `hosts_check_worker_log` and `hosts_clean_worker_log` procedures, respectively.
+You can investigate hosts install logs through `hosts_check_install_log_*` functions. You can also check and clean remote worker logs through `hosts_check_worker_log` and `hosts_clean_worker_log` procedures, respectively. Moreover, you can investigate dmesg through `hosts_check_worker_dmesg`.
 
 The functions (excluding `hosts_scan_available`) stop the script if any part of the procedure fails.
 

remote-commands.sh

@@ -19,6 +19,7 @@ HOSTS_SCANNED_FILE="remote-hosts-scanned.txt"
 DEBIAN_PACKAGES_TO_INSTALL="build-essential gfortran ed htop libxml2-dev ca-certificates curl libcurl4-openssl-dev gdebi-core sshpass default-jre default-jdk libpcre3-dev zlib1g-dev liblzma-dev libbz2-dev libicu-dev"
 REMOTE_DETECT_LOGICAL_CPUS="FALSE"
 MIN_HOSTS=1
+SWAP_PART="/dev/mapper/linux-swap"
 
 SHELL_SCRIPT=$(basename $0)
 LOG_STEPS="logs/${SHELL_SCRIPT%.*}".log
@@ -279,6 +280,17 @@ hosts_scan_available()
     done
 }
 
+hosts_enable_swap()
+{
+    info "Enabling swap on hosts"
+    for host in "${HOSTS_ARRAY[@]}"; do
+        step "-- ${host}"
+        try ssh ${SSH_OPTIONS} -i ${SSH_KEYS_DIR}/${SSH_KEY_PRIV} ${SSH_USER}@${host} "swapon $SWAP_PART"
+        next
+    done
+    check_if_command_error
+}
+
 hosts_push_r_libraries_dump()
 {
     info "Pushing R libraries dump to hosts"
@@ -383,7 +395,8 @@ make_remote_connection_list()
             info "'number of cores' per host" 
             for host in "${HOSTS_ARRAY[@]}"; do
                 step "-- ${host}"
-                cornum=`try ssh ${SSH_OPTIONS} -i ${SSH_KEYS_DIR}/${SSH_KEY_PRIV} ${SSH_USER}@${host} '/usr/bin/Rscript -e "cat(parallel::detectCores(logical = ${REMOTE_DETECT_LOGICAL_CPUS}))"'`
+                
+                [[ $REMOTE_DETECT_LOGICAL_CPUS == "TRUE" ]] && cornum=`ssh ${SSH_OPTIONS} -i ${SSH_KEYS_DIR}/${SSH_KEY_PRIV} ${SSH_USER}@${host} 'lscpu | grep "^CPU(s):" | grep -o "[0-9]*"'` || cornum=`ssh ${SSH_OPTIONS} -i ${SSH_KEYS_DIR}/${SSH_KEY_PRIV} ${SSH_USER}@${host} 'A=\$(lscpu | grep "Socket(s):" | grep -o "[0-9]*"); B=\$(lscpu | grep "Core(s) per socket:" | grep -o "[0-9]*"); echo \$((A*B))'`
 
                 regex='^[0-9]+$'
                 if ! [[ $cornum =~ $regex ]] ; then
@@ -433,6 +446,18 @@ hosts_check_worker_log()
     check_if_command_error
 }
 
+hosts_check_worker_dmesg()
+{
+    info "Checking dmesg on hosts"
+    for host in "${HOSTS_ARRAY[@]}"; do
+        step "-- ${host}"
+        echo
+        try ssh ${SSH_OPTIONS/-q/} -o LogLevel=error -i ${SSH_KEYS_DIR}/${SSH_KEY_PRIV} ${SSH_USER}@${host} "dmesg -T | tail -n 20"
+        next
+    done
+    check_if_command_error
+}
+
 hosts_clean_worker_log()
 {
     info "Cleaning workers logs"
@@ -472,6 +497,7 @@ configure_hosts()
     generate_ssh_keys
     hosts_push_ssh_key
     hosts_push_shell_script
+    hosts_enable_swap
     dump_project_r_files
     dump_r_libraries
     hosts_push_project_r_files