Memory usage continues to increase.

[wangzm5573]

Memory usage continues to increase although the old controls have been removed.

Code example to reproduce the issue:

import flet, time



def main1(page: flet.Page) -> None:
    column1 = flet.Column(
        alignment = flet.MainAxisAlignment.CENTER,
    )
    column2 = flet.Column(
        alignment = flet.MainAxisAlignment.CENTER,
    )
    container = flet.Container(
        alignment = flet.alignment.center,
        expand = True,
        content = column1
    )
    page.add(container)
    for index in range(1, 10):
        print(index)
        column1.controls.clear()
        hugeThing = flet.Text(
            data = f"{index %10}" *(1024 *1024 *128),
            value = f"{index}"
        )
        column1.controls.append(hugeThing)
        page.update()
        time.sleep(0.1)
        column1.controls.clear()
        page.update()


def main2(page: flet.Page) -> None:
    column1 = flet.Column(
        alignment = flet.MainAxisAlignment.CENTER,
    )
    column2 = flet.Column(
        alignment = flet.MainAxisAlignment.CENTER,
    )
    container = flet.Container(
        alignment = flet.alignment.center,
        expand = True,
        content = column1
    )
    page.add(container)
    for index in range(1, 10):
        print(index)
        container.content = column1
        column1.controls.clear()
        hugeThing = flet.Text(
            data = f"{index %10}" *(1024 *1024 *128),
            value = f"{index}"
        )
        column1.controls.append(hugeThing)
        page.update()
        time.sleep(0.1)
        column1.controls.clear()
        page.update()
        container.content = column2
        page.update()



def main3(page: flet.Page) -> None:
    column1 = flet.Column(
        alignment = flet.MainAxisAlignment.CENTER,
    )
    column2 = flet.Column(
        alignment = flet.MainAxisAlignment.CENTER,
    )
    container = flet.Container(
        alignment = flet.alignment.center,
        expand = True,
        content = column1
    )
    page.add(container)
    for index in range(1, 10000):
        print(index)
        container.content = column1
        column1.controls.clear()
        hugeThing = flet.Text(
            data = f"{index %10}" *(1024 *1024 *128),
            value = f"{index}"
        )
        column1.controls.append(hugeThing)
        page.update()
        time.sleep(0.1)
        column1.controls.clear()
        container.content = column2
        page.update()



flet.app(target = main1, port = 5773, view = flet.FLET_APP, web_renderer = "auto") # normal: Memory usage is 25 ~ 150MB.
flet.app(target = main2, port = 5773, view = flet.FLET_APP, web_renderer = "auto") # normal: Memory usage is 25 ~ 150MB.
flet.app(target = main3, port = 5773, view = flet.FLET_APP, web_renderer = "auto") # bug: Memory usage continues to increase.

Flet version (pip show flet):

Name: flet
Version: 0.5.0.dev1252
Summary: Flet for Python - easily build interactive multi-platform apps in Python
Home-page:
Author: Appveyor Systems Inc.
Author-email: hello@flet.dev
License: Apache-2.0
Location: C:\Program Files\Python311\Lib\site-packages
Requires: flet-core, httpx, oauthlib, packaging, watchdog, websocket-client, websockets
Required-by:

Operating system: Windows 11

[gbrandt]

Should this be added to #969?

[FeodorFitsner]

@wangzm5773 could you please clarify what process "eats" the memory: Python, flet or fletd?

[wangzm5573]

Should this be added to #969?

Hmm.. maybe..?

[wangzm5573]

@wangzm5773 could you please clarify what process "eats" the memory: Python, flet or fletd?

It's python.exe

[FeodorFitsner]

Geez, is it 1.4 GB?

[wangzm5573]

Geez, is it 1.4 GB?

Yes. When running the main3 function, the memory usage will continue to increase rapidly until a MemoryError is raised.

[FeodorFitsner]

I've been able to fix this issue. The fix is coming in 0.5.0 release due to today/tomorrow. Good case, thanks :)