Runtime.exec : vfork() concerns and a fix proposal

[David Lloyd]

On Wed, Sep 12, 2018 at 2:04 AM Thomas Stüfe <thomas.stuefe at gmail.com> wrote:
> Hi David,
>
> On Tue, Sep 11, 2018 at 8:29 PM, David Lloyd <david.lloyd at redhat.com> wrote:
> > I think this is a cool idea.
>
> Thanks. I think I did not come up with it though, I think the
> technique was known already.
>
> > Do you have any performance numbers?
>
> Sure:
>
> small program, just spawning off /bin/true a 1000 times, measured on
> my t450s running Ubuntu 16.4:
>
> Number open files:   <none>           1000       100000
>
> openjdk8:                  305ms             1.5s        115s
> sapjvm8:                   721ms              2.3s       142s
>
> factor                         2.4                   1.53        1.23

This doesn't seem too bad, even for a first implementation.  I wonder
if it could be improved further using e.g. shared memory to reduce
syscalls?

-- 
- DML