Here you will learn how to build and run the simplest example and measure the startup time on Linux using Debian packages
sudo apt install linux-tools-common linux-tools-generic
sudo sysctl kernel.perf_event_paranoid=1
scala-cli --power package --assembly example01.sc --force -o example01.jar
ls -l ./example01.jar
perf stat -r 100 ./example01.jar > /dev/nullExpected output:
Performance counter stats for './example01.jar' (100 runs):
164,40 msec task-clock # 1,532 CPUs utilized ( +- 0,18% )
823 context-switches # 5,006 K/sec ( +- 0,29% )
14 cpu-migrations # 85,160 /sec ( +- 2,47% )
10 073 page-faults # 61,273 K/sec ( +- 0,06% )
739 505 378 cycles # 4,498 GHz ( +- 0,20% )
911 793 014 instructions # 1,23 insn per cycle ( +- 0,06% )
179 997 789 branches # 1,095 G/sec ( +- 0,06% )
7 171 265 branch-misses # 3,98% of all branches ( +- 0,11% )
TopdownL1 # 13,5 % tma_backend_bound
# 34,9 % tma_bad_speculation
# 32,5 % tma_frontend_bound
# 19,0 % tma_retiring ( +- 0,10% )
0,107341 +- 0,000322 seconds time elapsed ( +- 0,30% )
curl https://raw.githubusercontent.com/creationix/nvm/master/install.sh | bash
source ~/.bashrc
nvm install 16
sudo sysctl kernel.perf_event_paranoid=1
scala-cli --power package --js --js-mode release example01.sc --force -o example01.js
ls -l ./example01.js
perf stat -r 100 node ./example01.js > /dev/nullExpected output:
Performance counter stats for 'node ./example01.js' (100 runs):
31,00 msec task-clock # 0,990 CPUs utilized ( +- 0,25% )
25 context-switches # 806,523 /sec ( +- 10,21% )
1 cpu-migrations # 32,261 /sec ( +- 13,03% )
3 361 page-faults # 108,429 K/sec ( +- 0,03% )
145 717 779 cycles # 4,701 GHz ( +- 0,22% )
231 347 563 instructions # 1,59 insn per cycle ( +- 0,15% )
40 439 616 branches # 1,305 G/sec ( +- 0,15% )
1 344 209 branch-misses # 3,32% of all branches ( +- 0,05% )
TopdownL1 # 14,2 % tma_backend_bound
# 20,0 % tma_bad_speculation
# 34,7 % tma_frontend_bound
# 31,1 % tma_retiring ( +- 0,20% )
0,031317 +- 0,000465 seconds time elapsed ( +- 1,49% )
sudo apt install linux-tools-common linux-tools-generic gcc zlib1g-dev
sudo sysctl kernel.perf_event_paranoid=1
scala-cli --power package --graalvm-jvm-id graalvm-java21:21.0.1 --native-image example01.sc --force -o example01_graalvm.bin -- --no-fallback
ls -l ./example01_graalvm.bin
perf stat -r 100 ./example01_graalvm.bin > /dev/nullExpected output:
Performance counter stats for './example01_graalvm.bin' (100 runs):
1,93 msec task-clock # 0,898 CPUs utilized ( +- 1,11% )
10 context-switches # 5,170 K/sec ( +- 7,95% )
0 cpu-migrations # 0,000 /sec
703 page-faults # 363,484 K/sec ( +- 0,04% )
8 279 606 cycles # 4,281 GHz ( +- 1,23% )
12 248 386 instructions # 1,48 insn per cycle ( +- 1,00% )
2 378 672 branches # 1,230 G/sec ( +- 0,88% )
24 150 branch-misses # 1,02% of all branches ( +- 0,71% )
TopdownL1 # 30,1 % tma_backend_bound
# 8,9 % tma_bad_speculation
# 29,9 % tma_frontend_bound
# 31,1 % tma_retiring ( +- 1,23% )
0,002154 +- 0,000177 seconds time elapsed ( +- 8,20% )
sudo apt install linux-tools-common linux-tools-generic clang libstdc++-12-dev libgc-dev
sudo sysctl kernel.perf_event_paranoid=1
scala-cli --power package --native-version 0.5.4 --native example01.sc --native-mode release-full --force -o example01_native.bin
ls -l ./example01_native.bin
perf stat -r 100 ./example01_native.bin > /dev/nullExpected output:
Performance counter stats for './example01_native.bin' (100 runs):
0,77 msec task-clock # 0,766 CPUs utilized ( +- 0,88% )
0 context-switches # 0,000 /sec
0 cpu-migrations # 0,000 /sec
258 page-faults # 333,144 K/sec ( +- 0,08% )
3 381 379 cycles # 4,366 GHz ( +- 0,96% )
5 367 398 instructions # 1,59 insn per cycle ( +- 0,59% )
972 469 branches # 1,256 G/sec ( +- 0,56% )
16 431 branch-misses # 1,69% of all branches ( +- 0,49% )
TopdownL1 # 25,0 % tma_backend_bound
# 11,8 % tma_bad_speculation
# 29,5 % tma_frontend_bound
# 33,7 % tma_retiring ( +- 0,95% )
0,001011 +- 0,000114 seconds time elapsed ( +- 11,23% )
An example of a command line application that reads the system input, parses and validates JSON according to the latest specification and in case of any error prints it to the system error output.
Scala.js build is missing because it doesn't support reading from the system input.
No GC options are used to speed up JSON validation for all supported builds.
Also, this script was tested with large (megabytes) and huge (gigabytes) inputs that could be downloaded and unpacked using following commands:
wget https://raw.githubusercontent.com/json-iterator/test-data/master/large-file.json
wget https://webtpa-public-access.s3.us-west-2.amazonaws.com/subfolder/2023_06_430_65B0_in_network_rates.json.gz
gunzip 2023_06_430_65B0_in_network_rates.json.gzscala-cli --power package --assembly example02.sc --force -o example02.jar
ls -l ./example02.jar
time ./example02.jar -J-XX:+UnlockExperimentalVMOptions -J-XX:+UseEpsilonGC -J-Xms8m -J-Xmx8m -J-XX:+AlwaysPreTouch < 2023_06_430_65B0_in_network_rates.json 2> /dev/nullExpected output:
real 1m6,675s
user 1m3,442s
sys 0m3,448s
scala-cli --power package --graalvm-jvm-id graalvm-java21:21.0.1 --native-image example02.sc --force -o example02_graalvm.bin -- --no-fallback --gc=epsilon
ls -l ./example02_graalvm.bin
time ./example02_graalvm.bin < 2023_06_430_65B0_in_network_rates.json 2> /dev/nullExpected output:
real 1m50,180s
user 1m46,471s
sys 0m3,436s
scala-cli --power package --native-version 0.5.4 --native example02.sc --native-mode release-full --native-gc none --native-lto thin --native-multithreading=false --force -o example02_native.bin
ls -l ./example02_native.bin
time ./example02_native.bin < 2023_06_430_65B0_in_network_rates.json 2> /dev/nullExpected output:
real 1m27,921s
user 1m22,861s
sys 0m4,003s