Flutter Infrastructure Foundation

Flutter Infrastructure Foundation

The Flutter Infrastructure Foundation Team is responsible for setting up, maintaining and improving the low level infrastructure used to build, test and release Flutter.

DeviceLab Hardware

Flutter keeps a lab of test beds that include hosts and phones for all the supported platforms. These test beds are used to collect performance benchmarks and detect regressions.

As of May 2023 the Flutter DeviceLab contains 99 test beds with the following hardware and software:

Host	Architecture	Phone	Count
Linux	X64	Android	36
Windows	X64	Android	6
Windows	Arm64	Android	1
Windows	Arm64		9
Mac	X64	iOS	18
Mac	X64		2
Mac	Arm64	iOS	12
Mac	Arm64		1
Mac	X64	Android	9
Mac	Arm64	Android	5

VMs

Flutter uses Linux and Windows virtual machines to build and test Flutter. These VMs are auto-provisioned and distributed to 4 different pools. The following is the configuration distribution:

LUCI pool	config	os	cpus	count	total cpus
luci.flutter.prod	e2-standard-32	Linux	32	15	480
luci.flutter.prod	n1-standard-8	Linux	8	135	1080
luci.flutter.try	e2-standard-32	Linux	32	30	960
luci.flutter.try	n1-standard-8	Linux	8	137	1096
luci.flutter.staging	e2-standard-32	Linux	32	4	128
luci.flutter.staging	n1-standard-8	Linux	8	30	240
luci.dart-internal.flutter	e2-standard-32	Linux	32	20	640
luci.flutter.prod	e2-highmem-8	Windows	8	59	472
luci.flutter.try	e2-highmem-8	Windows	8	130	1040
luci.flutter.staging	e2-highmem-8	Windows	8	12	96
luci.dart-internal.flutter	e2-highmem-8	Windows	8	20	160
Totals				592	6392

Mac hostonly machines

Mac machines are organized in a different category because they are provisioned in chrome labs and have no phones attached. The machine configurations are the following:

LUCI pool	model	os	count
luci.flutter.prod	Macmini8,1	Mac-12.6-21G115	28
luci.flutter.prod	Macmini9,1	Mac-12.6-21G115	31
luci.flutter.try	Macmini8,1	Mac-12.6-21G115	74
luci.flutter.try	Macmini9,1	Mac-12.6-21G115	71
luci.flutter.staging	Macmini8,1	Mac-12.6-21G115	5
luci.flutter.staging	Macmini9,1	Mac-12.6-21G115	7
luci.dart-internal.flutter	Macmini8,1	Mac-12.6-21G116	15
luci.dart-internal.flutter	Macmini9,1	Mac-12.6-21G117	2
Totals			233

Services

Flutter Infrastructure Foundation owns the DeviceLab provisioning services, maintains Flutter LUCI service configurations, and provides lab maintenance services.

This is the list of services with their descriptions:

Service	Type	Description
SALT	Owned	Configuration provisioning service used to push configurations as code for host and devices for all the supported platforms.
Machine Provider	Configuration management	Configuration service to provision, spin up and tear down virtual machines.
LUCI swarming bot	Owned	Scripts used to set up and tear down LUCI services on the supported platforms.
Capacity planning and delivery	Owned	Budgeting for lab expansions, delivery of new capacity, and decommissioning of end of life hardware.
Lab maintenance	Owned	Faulty hardware replacement, hardware recovery and reprovisioning. Lab migrations planning and execution.
Onboarding of new platforms	Owned	Creating provisioning SALT scripts and onboarding on LUCI services.
Device doctor	Owned	Phone configuration validation and device recovery.