CI: improvements in test reliability and performance

- CI default: raise parallelism to 20
- CI valgind: set parallelism to 6
- CI non-native: adapt parallelism for OS builds
- CI Windows: no longer ignore FTP, TFTP, MQTT and SMTP
- CI Windows: restrict test timeout to 10 minutes
- CI Windows: do not run tests for msh3 build
- tests, various: restrict curl invocation to ipv4 to avoid talking to
  any ipv6 test server running in parallel
- tests: requiring http/2 server no longer needs to mention http server
- test 190: use a fixed timeout of 10 seconds instead of %FTPTIME2, as
  that value rises under parallel load beyond what the server is waiting
  and then produces different results
- test 1540: add debug logging
- testrunner: add verify checks for http/2 and http/3 server

Closes #15040

.github/workflows/cygwin.yml

@@ -122,7 +122,7 @@ jobs:
         if: ${{ matrix.build == 'automake' && matrix.tflags != 'skipall' && matrix.tflags != 'skiprun' }}
         timeout-minutes: 15
         run: |
-          export TFLAGS='-j8 ${{ matrix.tflags }} ~615'
+          export TFLAGS='-j20 ${{ matrix.tflags }} ~615'
           if [ -x "$(cygpath "${SYSTEMROOT}/System32/curl.exe")" ]; then
             TFLAGS+=" -ac $(cygpath "${SYSTEMROOT}/System32/curl.exe")"
           fi

.github/workflows/linux.yml

@@ -649,7 +649,7 @@ jobs:
         run: |
           export TFLAGS='${{ matrix.build.tflags }}'
           if [[ '${{ matrix.build.install_packages }}' = *'valgrind'* ]]; then
-            TFLAGS+=' -j4'
+            TFLAGS+=' -j6'
           fi
           if [[ '${{ matrix.build.install_packages }}' = *'heimdal-dev'* ]]; then
             TFLAGS+=' ~2077 ~2078'  # valgrind errors

.github/workflows/macos.yml

@@ -231,7 +231,7 @@ jobs:
       - name: 'run tests'
         timeout-minutes: 20
         run: |
-          export TFLAGS='-j10 ${{ matrix.tflags }}'
+          export TFLAGS='-j20 ${{ matrix.tflags }}'
           TFLAGS+=' ~2037 ~2041'  # flaky
           if [[ '${{ matrix.compiler }}' = 'gcc'* ]]; then
             TFLAGS+=' ~RTSP'  # 567 568 569 570 571 572 577 689 3100
@@ -381,7 +381,7 @@ jobs:
       - name: 'cmake run tests'
         timeout-minutes: ${{ matrix.build.torture && 20 || 10 }}
         run: |
-          export TFLAGS='-j10 ${{ matrix.build.tflags }}'
+          export TFLAGS='-j20 ${{ matrix.build.tflags }}'
           if [ -z '${{ matrix.build.torture }}' ]; then
             TFLAGS+=' ~2037 ~2041'  # flaky
             if [[ '${{ matrix.compiler }}' = 'gcc'* ]]; then

.github/workflows/non-native.yml

@@ -66,7 +66,7 @@ jobs:
             bld/src/curl --disable --version
             if [ '${{ matrix.arch }}' = 'x86_64' ]; then  # Slow on emulated CPU
               cmake --build bld --config Debug --parallel 3 --target testdeps
-              export TFLAGS='-j0'  # flakies: ~389 ~392 ~TFTP and more
+              export TFLAGS='-j4'
               cmake --build bld --config Debug --target test-ci
             fi
             echo '::group::build examples'
@@ -146,7 +146,7 @@ jobs:
             src/curl --disable --version
             if [ '${{ matrix.arch }}' = 'x86_64' ]; then  # Slow on emulated CPU
               make -j3 -C tests
-              make test-ci V=1 TFLAGS='-j8 ~FTP'
+              make test-ci V=1 TFLAGS='-j4'
             fi
             echo '::group::build examples'
             make -j3 examples
@@ -176,7 +176,6 @@ jobs:
             bld/src/curl --disable --version
             if [ '${{ matrix.arch }}' = 'x86_64' ]; then  # Slow on emulated CPU
               cmake --build bld --config Debug --parallel 3 --target testdeps
-              export TFLAGS='-j8 ~FTP'
               cmake --build bld --config Debug --target test-ci
             fi
             echo '::group::build examples'
@@ -206,7 +205,7 @@ jobs:
             gmake -j3 install
             src/curl --disable --version
             gmake -j3 -C tests
-            gmake test-ci V=1 TFLAGS='-j12 ~MQTT ~FTP'
+            gmake test-ci V=1
             echo '::group::build examples'
             gmake -j3 examples
             echo '::endgroup::'

.github/workflows/windows.yml

@@ -149,11 +149,11 @@ jobs:
 
       - name: 'autotools run tests'
         if: ${{ matrix.build == 'autotools' && matrix.tflags != 'skipall' && matrix.tflags != 'skiprun' }}
-        timeout-minutes: 14
+        timeout-minutes: 10
         run: |
-          export TFLAGS='-j14 ${{ matrix.tflags }} ~SCP'
+          export TFLAGS='-j8 ${{ matrix.tflags }} ~SCP'
           if [ '${{ matrix.sys }}' != 'msys' ]; then
-            TFLAGS+=' ~TFTP ~MQTT ~WebSockets ~SMTP ~FTP'
+            TFLAGS+=' ~2301 ~2302'  # WebSockets'
             TFLAGS+=' ~612 ~613 ~616 ~618'  # SFTP
           else
             TFLAGS+=' ~SFTP'
@@ -243,11 +243,11 @@ jobs:
 
       - name: 'cmake run tests'
         if: ${{ matrix.build == 'cmake' && matrix.tflags != 'skipall' && matrix.tflags != 'skiprun' }}
-        timeout-minutes: 14
+        timeout-minutes: 10
         run: |
-          export TFLAGS='-j14 ${{ matrix.tflags }} ~SCP'
+          export TFLAGS='-j8 ${{ matrix.tflags }} ~SCP'
           if [ '${{ matrix.sys }}' != 'msys' ]; then
-            TFLAGS+=' ~TFTP ~MQTT ~WebSockets ~SMTP ~FTP'
+            TFLAGS+=' ~WebSockets'
             TFLAGS+=' ~612 ~613 ~616 ~618'  # SFTP
           else
             TFLAGS+=' ~SFTP'
@@ -374,10 +374,10 @@ jobs:
 
       - name: 'cmake run tests'
         if: ${{ matrix.tflags != 'skipall' && matrix.tflags != 'skiprun' }}
-        timeout-minutes: 14
+        timeout-minutes: 10
         run: |
           PATH="$(cygpath "${USERPROFILE}")/my-cache/${{ matrix.dir }}/bin:/c/msys64/usr/bin:$PATH"
-          export TFLAGS='-j14 ~TFTP ~MQTT ~WebSockets ~FTP ${{ matrix.tflags }}'
+          export TFLAGS='-j4 ~WebSockets ${{ matrix.tflags }}'
           if [ -x "$(cygpath "${SYSTEMROOT}/System32/curl.exe")" ]; then
             TFLAGS+=" -ac $(cygpath "${SYSTEMROOT}/System32/curl.exe")"
           fi
@@ -531,7 +531,7 @@ jobs:
             arch: 'x64'
             plat: 'windows'
             type: 'Debug'
-            tflags: '~1516'
+            tflags: 'skipall'
             config: '-DENABLE_DEBUG=ON -DENABLE_UNICODE=OFF -DCURL_USE_SCHANNEL=OFF -DCURL_BROTLI=ON -DCURL_ZSTD=ON -DBUILD_SHARED_LIBS=OFF -DCURL_USE_LIBSSH2=ON -DUSE_MSH3=ON -DCURL_USE_GSASL=ON'
       fail-fast: false
     steps:
@@ -617,9 +617,9 @@ jobs:
 
       - name: 'cmake run tests'
         if: ${{ matrix.tflags != 'skipall' && matrix.tflags != 'skiprun' }}
-        timeout-minutes: 16
+        timeout-minutes: 10
         run: |
-          export TFLAGS='-j14 ~TFTP ~MQTT ~WebSockets ~SMTP ~FTP ~SCP ~612 ${{ matrix.tflags }}'
+          export TFLAGS='-j8 ~WebSockets ~SCP ~612 ${{ matrix.tflags }}'
           if [[ '${{ matrix.install }}' = *'libssh2[core,zlib]'* ]]; then
             TFLAGS+=' ~SFTP'
           elif [[ '${{ matrix.install }}' = *'libssh '* ]]; then