diff --git a/.travis.yml b/.travis.yml
index 372eebe05..dd59d6f58 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -59,9 +59,14 @@ jobs:
       script: ci/test.sh vlt
     - if: type != cron
       stage: test
-      name: Vltmt test
+      name: Vltmt set 0 test
       compiler: gcc
-      script: ci/test.sh vltmt
+      script: ci/test.sh vltmt0
+    - if: type != cron
+      stage: test
+      name: Vltmt set 1 test
+      compiler: gcc
+      script: ci/test.sh vltmt1
 # Cron builds try different OS/compiler combinations
     - if: type = cron
       stage: "Build Verilator"
diff --git a/ci/test.sh b/ci/test.sh
index 6b72bc5cb..c39769723 100755
--- a/ci/test.sh
+++ b/ci/test.sh
@@ -19,6 +19,12 @@ case $1 in
     vltmt)
         make -C test_regress SCENARIOS=--vltmt
         ;;
+    vltmt0)
+        make -C test_regress SCENARIOS=--vltmt HASHSET=--hashset=0/2
+        ;;
+    vltmt1)
+        make -C test_regress SCENARIOS=--vltmt HASHSET=--hashset=1/2
+        ;;
     *)
     echo "Usage: test.sh (dist|vlt|vltmt)"
     exit -1
diff --git a/test_regress/Makefile b/test_regress/Makefile
index 82fff4a4d..e105ee9af 100644
--- a/test_regress/Makefile
+++ b/test_regress/Makefile
@@ -43,10 +43,11 @@ endif
 ######################################################################
 
 SCENARIOS ?= --vlt --vltmt --dist
+DRIVER_HASHSET ?=
 
 .PHONY: test
 test:
-	$(PERL) driver.pl $(DRIVER_FLAGS) $(SCENARIOS)
+	$(PERL) driver.pl $(DRIVER_FLAGS) $(SCENARIOS) $(DRIVER_HASHSET)
 
 ######################################################################
 
diff --git a/test_regress/driver.pl b/test_regress/driver.pl
index 1cb2c5536..1d967ba8c 100755
--- a/test_regress/driver.pl
+++ b/test_regress/driver.pl
@@ -66,6 +66,7 @@ my $opt_gdb;
 my $opt_rr;
 my $opt_gdbbt;
 my $opt_gdbsim;
+my $opt_hashset;
 my $opt_jobs = 1;
 my $opt_optimize;
 my $opt_quiet;
@@ -90,6 +91,7 @@ if (! GetOptions(
           "gdbbt!"      => \$opt_gdbbt,
           "gdbsim!"     => \$opt_gdbsim,
           "golden!"     => sub { $ENV{HARNESS_UPDATE_GOLDEN} = 1; },
+          "hashset=s"   => \$opt_hashset,
           "help"        => \&usage,
           "j=i"         => \$opt_jobs,
           "optimize:s"  => \$opt_optimize,
@@ -141,6 +143,8 @@ if ($#opt_tests<0) {  # Run everything
         push @opt_tests, sort(glob("${dir}/t_*.pl"));
     }
 }
+@opt_tests = _calc_hashset(@opt_tests) if $opt_hashset;
+
 if ($#opt_tests>=2 && $opt_jobs>=2) {
     # Without this tests such as t_debug_sigsegv_bt_bad.pl will occasionally
     # block on input and cause a SIGSTOP, then a "fg" was needed to resume testing.
@@ -261,6 +265,25 @@ sub calc_jobs {
     return $ok + 1;
 }
 
+sub _calc_hashset {
+    my @in = @_;
+    return @in if !$opt_hashset;
+    $opt_hashset =~ m!^(\d+)/(\d+)$!
+        or die "%Error: Need number/number format for --hashset: $opt_hashset\n";
+    my ($set, $nsets) = ($1, $2);
+    my @new;
+    foreach my $t (@opt_tests) {
+        my $checksum = do {
+            local $/;
+            unpack("%32W*", $t);
+        };
+        if ($set == ($checksum % $nsets)) {
+            push @new, $t;
+        }
+    }
+    return @new;
+}
+
 #######################################################################
 #######################################################################
 #######################################################################
@@ -2503,6 +2526,11 @@ Run Verilator generated executable under the debugger.
 
 Update golden files, equivalent to setting HARNESS_UPDATE_GOLDEN=1.
 
+=item --hashset I<set>/I<numsets>
+
+Split tests based on a hash of the test names into I<numsets> and run only
+tests in set number I<set> (0..I<numsets>-1).
+
 =item --help
 
 Displays this message and program version and exits.