diff --git a/.github/workflows/check.yaml b/.github/workflows/check.yaml
index cfc113cfbd44..cdd575065e11 100644
--- a/.github/workflows/check.yaml
+++ b/.github/workflows/check.yaml
@@ -6,7 +6,7 @@ jobs:
     steps:
       - uses: actions/setup-go@v2
         with:
-          go-version: 1.16
+          go-version: 1.17
       - name: Checkout code
         uses: actions/checkout@v2
       - name: Restore cache
diff --git a/.github/workflows/pd-docker-image.yaml b/.github/workflows/pd-docker-image.yaml
new file mode 100644
index 000000000000..355fa122ec67
--- /dev/null
+++ b/.github/workflows/pd-docker-image.yaml
@@ -0,0 +1,21 @@
+name: PD Docker Image
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+jobs:
+  chunks:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: true
+    steps:
+      - uses: actions/setup-go@v2
+        with:
+          go-version: 1.17
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Make
+        run: make docker-image
diff --git a/.github/workflows/pd-tests.yaml b/.github/workflows/pd-tests.yaml
index c29a68ec11a2..0307ce2aa12f 100644
--- a/.github/workflows/pd-tests.yaml
+++ b/.github/workflows/pd-tests.yaml
@@ -1,28 +1,24 @@
-name: PD Tests
+name: PD Test
 on:
   push:
     branches:
       - master
-      - release-4.0
-      - release-5.*
   pull_request:
     branches:
       - master
-      - release-4.0
-      - release-5.*
 jobs:
   chunks:
     runs-on: ubuntu-latest
     strategy:
       fail-fast: true
       matrix:
-        worker_id: [1, 2, 3, 4]
+        worker_id: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
     outputs:
-      job-total: ${{ strategy.job-total }}
+      job-total: 10
     steps:
       - uses: actions/setup-go@v2
         with:
-          go-version: 1.16
+          go-version: 1.17
       - name: Checkout code
         uses: actions/checkout@v2
       - name: Restore cache
@@ -34,31 +30,12 @@ jobs:
             **/.tools
             **/.dashboard_download_cache
           key: ${{ runner.os }}-go-${{ matrix.worker_id }}-${{ hashFiles('**/go.sum') }}
-          restore-keys: |
-            ${{ runner.os }}-go-${{ matrix.worker_id }}
-            ${{ runner.os }}-go-
-      - name: Dispatch Packages
-        id: packages-units
-        env:
-          WORKER_ID: ${{ matrix.worker_id }}
-        # github.com/tikv/pd/tests/server/tso is the integration test of TSO, which will take a long time,
-        # will be run independently in the TSO Function Test.
-        run: |
-          go list ./... | grep -v -E  "github.com/tikv/pd/server/api|github.com/tikv/pd/tests/client|github.com/tikv/pd/tests/server/tso" > packages.list
-          total=$(expr ${{ strategy.job-total }} - 1)
-          echo  "Dispatched ${total} normal chunks"
-          split packages.list -n r/${total} packages_unit_ -a 1 --numeric-suffixes=1
-          echo  "Dispatched 2 special task to the last chunk (the special tests take a long time)"
-          echo github.com/tikv/pd/server/api > packages_unit_${{ strategy.job-total }}
-          echo github.com/tikv/pd/tests/client >> packages_unit_${{ strategy.job-total }}
-          packages="{$(cat packages_unit_${WORKER_ID} |tr "\n" ",")}"
-          echo "This worker will test the chunk - ${packages}"
-          echo "::set-output name=list::${packages}"
       - name: Make Test
         env:
           WORKER_ID: ${{ matrix.worker_id }}
+          WORKER_COUNT: 10
         run: |
-          make test-with-cover TEST_PKGS="${{ steps.packages-units.outputs.list }}"
+          make ci-test-job JOB_COUNT=$WORKER_COUNT JOB_INDEX=$WORKER_ID
           mv covprofile covprofile_$WORKER_ID
           sed -i "/failpoint_binding/d" covprofile_$WORKER_ID
       - name: Upload coverage result ${{ matrix.worker_id }}
@@ -79,10 +56,7 @@ jobs:
       - name: Merge
         env:
           TOTAL_JOBS: ${{needs.chunks.outputs.job-total}}
-        run: |
-          echo ${TOTAL_JOBS}
-          for i in $(seq 1 $TOTAL_JOBS); do cat covprofile_$i >> covprofile; done
-          cat covprofile
+        run: for i in $(seq 1 $TOTAL_JOBS); do cat covprofile_$i >> covprofile; done
       - name: Send coverage
         uses: codecov/codecov-action@v1
         with:
diff --git a/.github/workflows/tso-consistency-test.yaml b/.github/workflows/tso-consistency-test.yaml
index a3e1de811df3..a489485d21cc 100644
--- a/.github/workflows/tso-consistency-test.yaml
+++ b/.github/workflows/tso-consistency-test.yaml
@@ -10,7 +10,7 @@ jobs:
     steps:
       - uses: actions/setup-go@v2
         with:
-          go-version: 1.16
+          go-version: 1.17
       - name: Checkout code
         uses: actions/checkout@v2
       - name: Make TSO Consistency Test
diff --git a/.github/workflows/tso-function-test.yaml b/.github/workflows/tso-function-test.yaml
index 0ce9cbddf732..cd493f332725 100644
--- a/.github/workflows/tso-function-test.yaml
+++ b/.github/workflows/tso-function-test.yaml
@@ -12,7 +12,7 @@ jobs:
     steps:
       - uses: actions/setup-go@v2
         with:
-          go-version: 1.16
+          go-version: 1.17
       - name: Checkout code
         uses: actions/checkout@v2
       - name: Make TSO Function Test
diff --git a/Makefile b/Makefile
index 3f356f18c92f..ccd9432611ff 100644
--- a/Makefile
+++ b/Makefile
@@ -98,6 +98,17 @@ stores-dump:
 
 .PHONY: pd-ctl pd-tso-bench pd-recover pd-analysis pd-heartbeat-bench simulator regions-dump stores-dump
 
+#### Docker image ####
+
+docker-image:
+	$(eval DOCKER_PS_EXIT_CODE=$(shell docker ps > /dev/null 2>&1 ; echo $$?))
+	@if [ $(DOCKER_PS_EXIT_CODE) -ne 0 ]; then \
+	echo "Encountered problem while invoking docker cli. Is the docker daemon running?"; \
+	fi
+	docker build --no-cache -t tikv/pd .
+
+.PHONY: docker-image
+
 #### Build utils ###
 
 swagger-spec: install-tools
@@ -133,7 +144,7 @@ install-tools:
 
 #### Static checks ####
 
-check: install-tools static tidy check-plugin errdoc check-testing-t docker-build-test
+check: install-tools static tidy check-plugin errdoc check-testing-t
 
 static: install-tools
 	@ # Not running vet and fmt through metalinter becauase it ends up looking at vendor
@@ -157,13 +168,6 @@ errdoc: install-tools
 	@echo "generator errors.toml"
 	./scripts/check-errdoc.sh
 
-docker-build-test:
-	$(eval DOCKER_PS_EXIT_CODE=$(shell docker ps > /dev/null 2>&1 ; echo $$?))
-	@if [ $(DOCKER_PS_EXIT_CODE) -ne 0 ]; then \
-	echo "Encountered problem while invoking docker cli. Is the docker daemon running?"; \
-	fi
-	docker build --no-cache -t tikv/pd .
-
 check-testing-t:
 	./scripts/check-testing-t.sh
 
@@ -226,15 +230,12 @@ basic-test: install-tools
 	go test $(BASIC_TEST_PKGS) || { $(FAILPOINT_DISABLE); exit 1; }
 	@$(FAILPOINT_DISABLE)
 
-test-with-cover: install-tools dashboard-ui
-	# testing all pkgs (expect TSO consistency test) with converage...
+ci-test-job: install-tools dashboard-ui
+	@$(DEADLOCK_ENABLE)
 	@$(FAILPOINT_ENABLE)
-	for PKG in $(TEST_PKGS); do\
-		set -euo pipefail;\
-		CGO_ENABLED=1 go test -race -covermode=atomic -coverprofile=coverage.tmp -coverpkg=./... $$PKG 2>&1 | grep -v "no packages being tested" && tail -n +2 coverage.tmp >> covprofile || { $(FAILPOINT_DISABLE); rm coverage.tmp && exit 1;}; \
-		rm coverage.tmp;\
-	done
+	CGO_ENABLED=1 go test -race -covermode=atomic -coverprofile=covprofile -coverpkg=./... $(shell ./scripts/ci-subtask.sh $(JOB_COUNT) $(JOB_INDEX)) || { $(FAILPOINT_DISABLE) && $(DEADLOCK_DISABLE) && exit 1;}
 	@$(FAILPOINT_DISABLE)
+	@$(DEADLOCK_DISABLE)
 
 TSO_INTEGRATION_TEST_PKGS := $(PD_PKG)/tests/server/tso
 
diff --git a/scripts/ci-subtask.sh b/scripts/ci-subtask.sh
new file mode 100755
index 000000000000..6cd1e659a0bf
--- /dev/null
+++ b/scripts/ci-subtask.sh
@@ -0,0 +1,30 @@
+#!/bin/bash
+
+# ./ci-subtask.sh <TOTAL_TASK_N> <TASK_INDEX>
+
+packages=(`go list ./...`)
+dirs=(`find . -iname "*_test.go" -exec dirname {} \; | sort -u | sed -e "s/^\./github.com\/tikv\/pd/"`)
+tasks=($(comm -12 <(printf "%s\n" "${packages[@]}") <(printf "%s\n" "${dirs[@]}")))
+
+weight () {
+    [[ $1 == "github.com/tikv/pd/server/api" ]] && return 30
+    [[ $1 == "github.com/tikv/pd/server/schedule" ]] && return 30
+    [[ $1 == "github.com/tikv/pd/tests/client" ]] && return 30
+    [[ $1 =~ "pd/tests" ]] && return 5
+    return 1
+}
+
+scores=(`seq "$1" | xargs -I{} echo 0`)
+
+res=()
+for t in ${tasks[@]}; do
+    min_i=0
+    for i in ${!scores[@]}; do
+        [[ ${scores[i]} -lt ${scores[$min_i]} ]] && min_i=$i
+    done
+    weight $t
+    scores[$min_i]=$((${scores[$min_i]} + $?))
+    [[ $(($min_i+1)) -eq $2 ]] && res+=($t)
+done
+
+printf "%s " "${res[@]}"
diff --git a/server/schedule/region_scatterer_test.go b/server/schedule/region_scatterer_test.go
index b708ade6f817..b77e226f9a7d 100644
--- a/server/schedule/region_scatterer_test.go
+++ b/server/schedule/region_scatterer_test.go
@@ -63,28 +63,13 @@ var _ = Suite(&testScatterRegionSuite{})
 
 type testScatterRegionSuite struct{}
 
-func (s *testScatterRegionSuite) TestSixStores(c *C) {
-	s.scatter(c, 6, 100, false)
-	s.scatter(c, 6, 100, true)
-	s.scatter(c, 6, 1000, false)
-	s.scatter(c, 6, 1000, true)
-}
-
-func (s *testScatterRegionSuite) TestFiveStores(c *C) {
-	s.scatter(c, 5, 100, false)
-	s.scatter(c, 5, 100, true)
-	s.scatter(c, 5, 1000, false)
-	s.scatter(c, 5, 1000, true)
-}
-
-func (s *testScatterRegionSuite) TestSixSpecialStores(c *C) {
-	s.scatterSpecial(c, 3, 6, 100)
-	s.scatterSpecial(c, 3, 6, 1000)
-}
-
-func (s *testScatterRegionSuite) TestFiveSpecialStores(c *C) {
-	s.scatterSpecial(c, 5, 5, 100)
-	s.scatterSpecial(c, 5, 5, 1000)
+func (s *testScatterRegionSuite) TestScatterRegions(c *C) {
+	s.scatter(c, 5, 50, true)
+	s.scatter(c, 5, 500, true)
+	s.scatter(c, 6, 50, true)
+	s.scatter(c, 5, 50, false)
+	s.scatterSpecial(c, 3, 6, 50)
+	s.scatterSpecial(c, 5, 5, 50)
 }
 
 func (s *testScatterRegionSuite) checkOperator(op *operator.Operator, c *C) {