<![CDATA[Phantom instances]]>I am using jsreport-core to convert html to pdf and send the pdf by email.

My structure is the following:

var jsreport = require ('jsreport-core') ();

var contentPDF = '<html> <body> hello world and other things ... </ body> </ html>';

jsreport.init (). then (function () {
    return jsreport.render ({
      template: {
        content: contentPDF,
        engine: 'none',
        recipe: 'phantom-pdf'
      }
    })
});

I have a service on my server that runs every so often, generates the reports that I have to generate and sends them, but I'm having problems with my server because phantom creates several instances and consumes a lot of memory and causes my server to die.

I'm trying to use something like this:

var jsreport = require ('jsreport-core') ();
jsreport.use (require ('jsreport-phantom-pdf') ({"numberOfWorkers": 1, "strategy": "phantom-server"}));

but it seems to have no effect; Do you have any suggestions or help that you can give me? Is that the solution or is there something that is ignoring or doing wrong?

I appreciate the help you can give me.

]]>https://forum.jsreport.net/topic/321/phantom-instancesRSS for NodeSun, 08 Mar 2026 03:56:35 GMTTue, 21 Nov 2017 03:30:52 GMT60<![CDATA[Reply to Phantom instances on Tue, 21 Nov 2017 07:17:38 GMT]]>I am using jsreport-core to convert html to pdf and send the pdf by email.

My structure is the following:

var jsreport = require ('jsreport-core') ();

var contentPDF = '<html> <body> hello world and other things ... </ body> </ html>';

jsreport.init (). then (function () {
    return jsreport.render ({
      template: {
        content: contentPDF,
        engine: 'none',
        recipe: 'phantom-pdf'
      }
    })
});

I have a service on my server that runs every so often, generates the reports that I have to generate and sends them, but I'm having problems with my server because phantom creates several instances and consumes a lot of memory and causes my server to die.

I'm trying to use something like this:

var jsreport = require ('jsreport-core') ();
jsreport.use (require ('jsreport-phantom-pdf') ({"numberOfWorkers": 1, "strategy": "phantom-server"}));

but it seems to have no effect; Do you have any suggestions or help that you can give me? Is that the solution or is there something that is ignoring or doing wrong?

I appreciate the help you can give me.

]]>https://forum.jsreport.net/post/1551https://forum.jsreport.net/post/1551Tue, 21 Nov 2017 07:17:38 GMT<![CDATA[Reply to Phantom instances on Tue, 21 Nov 2017 07:25:48 GMT]]>This initialization should result in using single phantomjs worker. Try to print logs to console.
For example by setting this at the top of your file.

process.env.debug = 'jsreport'
]]>https://forum.jsreport.net/post/1554https://forum.jsreport.net/post/1554Tue, 21 Nov 2017 07:25:48 GMT<![CDATA[Reply to Phantom instances on Invalid Date]]>Or write some debug information here .

]]>https://forum.jsreport.net/post/1555https://forum.jsreport.net/post/1555Invalid Date<![CDATA[Reply to Phantom instances on Invalid Date]]>I'm not good at debugging, but checking the phantomManager.js file I could verify that if the parameters are being passed and Phantom creates the instances that I configured.

var PhantomManager = module.exports = function (options) {
this._phantomInstances = [];
this.options = options || {};
this.options.workerEnv = this.options.workerEnv || {};
this.options.numberOfWorkers = this.options.numberOfWorkers || numCPUs;
console.log('PhantomManager this.options.numberOfWorkers ', this.options.numberOfWorkers);//log*************
this.options.timeout = this.options.timeout || 180000;
this.options.host = this.options.host || "127.0.0.1";
this.options.hostEnvVarName = this.options.hostEnvVarName || "PHANTOM_WORKER_HOST"
this.options.portEnvVarName = this.options.portEnvVarName || "PHANTOM_WORKER_PORT";
this._timeouts = [];
this.tasksQueue = [];
};

The problem is that you are not deleting those instances or reusing them, simply create new ones, which leaves my server without memory. I believe that with the kill method it removes the instances when the process ends:

process.once("exit", function () {
self.kill();
});

But he is not eliminating them. Help me please.

]]>https://forum.jsreport.net/post/2024https://forum.jsreport.net/post/2024Invalid Date<![CDATA[Reply to Phantom instances on Invalid Date]]>Do you call jsreport.init just once? The instances should be reused if you do.

]]>https://forum.jsreport.net/post/2029https://forum.jsreport.net/post/2029Invalid Date<![CDATA[Reply to Phantom instances on Mon, 12 Feb 2018 19:39:52 GMT]]>That said, that would be the problem. Then I ask for your help or advice in this regard; This is what my service does:

I do not want to schedule tasks in the cron of my server, so I created a service in NodeJs using cronjs library, which runs every hour and check in the database the reports that are scheduled at that time, I go through the elements of the I list one by one and for each report I execute the jsreport.init method, I create the report and send it, and every hour I do the same.

var job = new CronJob ({
cronTime: '0 0 * * * *',
onTick: function () {
    login()
    .then (getScheduledReports)
    .then (function (data) {
        data.reduce (function (promise, schReport) {

            // This is where I run the jsreport.init method and the code is similar to this one, please ignore the indentation and other details (hehe).

            jsreport.init (). then (function () {
                return jsreport.render ({
                  // parameters
                }). then (sendMail)
            });

        }, new Q ());
    }
},
start: true,
timeZone: 'America / Bogota'
});
job.start ();
]]>https://forum.jsreport.net/post/2031https://forum.jsreport.net/post/2031Mon, 12 Feb 2018 19:39:52 GMT<![CDATA[Reply to Phantom instances on Invalid Date]]>You should initialize jsreport just once. In the outer scope somewhere. Then call just jsreport.render.
I don't understand why you call init every time, can you elaborate on it?

]]>https://forum.jsreport.net/post/2032https://forum.jsreport.net/post/2032Invalid Date<![CDATA[Reply to Phantom instances on Invalid Date]]>I think I had a bad interpretation. I thought that the init method should be executed every time you want to render a report.

]]>https://forum.jsreport.net/post/2033https://forum.jsreport.net/post/2033Invalid Date<![CDATA[Reply to Phantom instances on Invalid Date]]>No, just once. Otherwise it would part of the render.
There is quite heavy code running inside init and that is why it is extracted.

]]>https://forum.jsreport.net/post/2035https://forum.jsreport.net/post/2035Invalid Date