# Microscope Server 2.8 and new SD images

**URL:** <https://openflexure.discourse.group/t/microscope-server-2-8-and-new-sd-images/284>\
**Category:** Announcements\
**Created:** [16 November 2020 14:04 UTC](https://openflexure.discourse.group/t/microscope-server-2-8-and-new-sd-images/284 "2020-11-16T14:04:36Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![jc2450](https://yyz2.discourse-cdn.com/free1/user_avatar/openflexure.discourse.group/jc2450/32/18_2.png) [@jc2450](https://openflexure.discourse.group/u/jc2450)\
**Post date:** [16 November 2020 14:04 UTC](https://openflexure.discourse.group/t/microscope-server-2-8-and-new-sd-images/284/1 "2020-11-16T14:04:36Z")

</div>

Today we’re releasing our Microscope Server v2.8, and some new Raspberry Pi SD images to go alongside.

## Server 2.8

To upgrade your microscope to the latest application, please run

```auto
sudo ofm update
sudo ofm upgrade

```

from your microscope shell.

## Changelog

### Client

- By making proper use of the capture resource changes (below), memory consumption has been drastically reduced.
- Fixed GPU preview requests being sent regardless of enabled status
- Allow already-running tasks to take over submit components
  - E.g. If a scan is already running when the client is loaded, the Start Scan button will be replaced with the already running scan progress

- Updated default task poll timeout to 1 second
- Changed main tab switcher to be data-driven

### Server

- Reduced the use of long-held composite locks
- Fixed ignored arguments in mock camera
- Overhauled `ofm rescue` scripts for simpler development
- Added use\_video\_port argument back to array()
- Move stream frame management into FrameStream class
- Removed old JSONResponse class
- Moved JSONEncoder class into `openflexure_microscope.json`
- Removed default config/settings files
- Updated all logging calls to new string format
- Updated to LabThings 1.1.3
- Improved args schema for captures
- Cleaned up Capture schemas
- Added full TileScanArgs schema
- Warn about unused settings when updating

#### Capture resource changes

- `metadata` key removed from capture array elements
- `acquisitionDate` renamed to `time` in Capture resource top-level
- `dataset` key added to top-level of Capture resources

## Memory efficiency measurements

To double check our memory management improvements, I’ve taken a very quick “representative example”. I acquired 1800 full resolution images across 2 scans, then rebooted the microscope and monitored memory usage after reloading.

**v2.7**  
Server: 107MB reserved memory  
Client: 165MB heap snapshot (JavaScript objects and DOM nodes)

**v2.8**  
Server: 77MB reserved memory  
Client: 47MB heap snapshot (JavaScript objects and DOM nodes)

_Please note, your memory improvement may not scale the same as this. A running server with no captures will still reserve ~70MB memory, so these improvements will mostly affect the usage on top of that as you start acquiring more data_

## New SD images

You can download our latest SD images from [https://openflexure.org/projects/microscope/build](https://openflexure.org/projects/microscope/build)