Groups > comp.lang.java.programmer > #39018

Re: Starting jshell takes about 15 seconds

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From	Andreas Leitgeb <avl@logic.at>
Newsgroups	comp.lang.java.programmer
Subject	Re: Starting jshell takes about 15 seconds
Date	Mon, 29 Jul 2019 08:01:24 -0000 (UTC)
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Arne Vajhøj <arne@vajhoej.dk> wrote:
> On 7/28/2019 12:04 PM, Cecil Westerhof wrote:
>> I have played with jshell before, but at the moment I am a bit more
>> serious with it. Starting jshell between 15 and 20 seconds. Executing
>> /reset takes 7 to 10 seconds.
>> This seems a bit long to me. For example starting ipython3 takes less
>> as two seconds. Is this normal, or is there a problem with my system?
>> I am working with Debian 9.
> Here starting jshell takes 1-3 seconds depending on the
> system. Windows 7 and Ubuntu 18.04 both with Java 11.

The machine's RAM and # of cores may be more significant here
than the OS or even the CPU or bogomips.

(And in case of enough RAM, then also whether jshell is already
in the cache versus first-start.)

PS: Ubuntu here with 8GB on core i7 2.80GHz (HW about 10 years old):
  first jshell start: roughly 6 secs, second one roughly 2 secs

$ time $JAVA12_HOME/bin/jshell <<< "/exit"
|  Welcome to JShell -- Version 12.0.2
|  For an introduction type: /help intro

jshell> |  Goodbye

real    0m1.708s      <--
user    0m4.728s      <-- that's where # of cores comes in.
sys     0m0.264s

Thread

Starting jshell takes about 15 seconds Cecil Westerhof <Cecil@decebal.nl> - 2019-07-28 18:04 +0200
  Re: Starting jshell takes about 15 seconds Arne Vajhøj <arne@vajhoej.dk> - 2019-07-28 19:56 -0400
    Re: Starting jshell takes about 15 seconds Andreas Leitgeb <avl@logic.at> - 2019-07-29 08:01 +0000
      Re: Starting jshell takes about 15 seconds Cecil Westerhof <Cecil@decebal.nl> - 2019-07-29 20:45 +0200
        Re: Starting jshell takes about 15 seconds Cecil Westerhof <Cecil@decebal.nl> - 2019-07-29 21:10 +0200
        Re: Starting jshell takes about 15 seconds Arne Vajhøj <arne@vajhoej.dk> - 2019-08-01 21:05 -0400
      Re: Starting jshell takes about 15 seconds Arne Vajhøj <arne@vajhoej.dk> - 2019-08-01 21:03 -0400

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