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Message: #08197

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[EP-tech] Error cannot allocate memory

Hi Lists,

Our repository sometimes having this error on the browser:

"Error calling df: Cannot allocate memory"

And checking on the log of the apache, I got this:
================
[Tue Jun 16 03:58:30.265596 2020] [:error] [pid 6987:tid 139987773269760] Apache2::RequestIO::read: (70008) Partial results are valid but processing is incomplete at
 (eval 685) line 5
------------------------------------------------------------------
---------------- EPrints System Error ----------------------------
------------------------------------------------------------------
Error calling df: Cannot allocate memory
------------------------------------------------------------------
 at /opt/eprints3/perl_lib/EPrints/System.pm line 349.
        EPrints::System::free_space('EPrints::System::linux=HASH(0x559787596f18)', '/opt/eprints3/archives/wiraraja/documents/disk0') called at /opt/eprints3/perl_li
b/EPrints/BackCompatibility.pm line 467
        EPrints::Platform::free_space('/opt/eprints3/archives/wiraraja/documents/disk0') called at /opt/eprints3/perl_lib/EPrints/Repository.pm line 1851
        EPrints::Repository::get_store_dir('EPrints::Repository=HASH(0x5597864b7c78)') called at /opt/eprints3/perl_lib/EPrints/DataObj/EPrint.pm line 597
        EPrints::DataObj::EPrint::get_defaults('EPrints::DataObj::EPrint', 'EPrints::Repository=HASH(0x5597864b7c78)', 'HASH(0x5597831a9800)', 'EPrints::DataSet=HASH
(0x55978814e1b0)') called at /opt/eprints3/perl_lib/EPrints/DataObj.pm line 259
        EPrints::DataObj::create_from_data('EPrints::DataObj::EPrint', 'EPrints::Repository=HASH(0x5597864b7c78)', 'HASH(0x559783197000)', 'EPrints::DataSet=HASH(0x5
5978814e1b0)') called at /opt/eprints3/perl_lib/EPrints/DataObj/EPrint.pm line 495
        EPrints::DataObj::EPrint::create_from_data('EPrints::DataObj::EPrint', 'EPrints::Repository=HASH(0x5597864b7c78)', 'HASH(0x559783197000)', 'EPrints::DataSet=
HASH(0x55978814e1b0)') called at /opt/eprints3/perl_lib/EPrints/DataSet.pm line 1013
        EPrints::DataSet::create_dataobj('EPrints::DataSet=HASH(0x55978814e1b0)', 'HASH(0x559783197000)') called at /opt/eprints3/perl_lib/EPrints/DataSet.pm line 10
07
        EPrints::DataSet::create_object('EPrints::DataSet=HASH(0x55978814e1b0)', 'EPrints::Repository=HASH(0x5597864b7c78)', 'HASH(0x559783197000)') called at /opt/e
prints3/perl_lib/EPrints/Plugin/Screen/NewEPrint.pm line 50
        EPrints::Plugin::Screen::NewEPrint::action_create('EPrints::Plugin::Screen::NewEPrint=HASH(0x559788872308)') called at /opt/eprints3/perl_lib/EPrints/Plugin/
Screen.pm line 240
        EPrints::Plugin::Screen::from('EPrints::Plugin::Screen::NewEPrint=HASH(0x559788872308)') called at /opt/eprints3/perl_lib/EPrints/ScreenProcessor.pm line 310
        EPrints::ScreenProcessor::process('EPrints::ScreenProcessor', 'session', 'EPrints::Repository=HASH(0x5597864b7c78)', 'template', undef, 'url', '/cgi/users/ho
me') called at /opt/eprints3/cgi/users/home line 25
        ModPerl::ROOT::ModPerl::Registry::opt_eprints3_cgi_users_home::handler('Apache2::RequestRec=SCALAR(0x5597832db168)') called at /usr/lib/perl5/ModPerl/Registr
yCooker.pm line 206
        eval {...} called at /usr/lib/perl5/ModPerl/RegistryCooker.pm line 206
        ModPerl::RegistryCooker::run('ModPerl::Registry=HASH(0x559783196fd0)') called at /usr/lib/perl5/ModPerl/RegistryCooker.pm line 172
        ModPerl::RegistryCooker::default_handler('ModPerl::Registry=HASH(0x559783196fd0)') called at /usr/lib/perl5/ModPerl/Registry.pm line 31
        ModPerl::Registry::handler('ModPerl::Registry', 'Apache2::RequestRec=SCALAR(0x5597832db168)') called at -e line 0
        eval {...} called at -e line 0
================

At the time of the error, tried to `df` using cli of eprints user, can give the disk free of the linux. 
Is there any way to debug more? Or the solution is just throw more RAM on the VM?

Eprints version: 3.3.15
OS: Linux Ubuntu 14.04
RAM: 1GB

Cheers,
Budiwijaya