Salesforce Chief Executive Marc Benioff spent $3 million last year adjusting salaries to ensure that men and women are paid equally within the company. Now he makes a habit of asking other tech CEOs when they’re going to do the same.

“Industries have spent billions of dollars to put in human resource management systems,” he said Friday at the closing keynote of the Grace Hopper Conference in Houston, the largest gathering of women in technology. “But the funny thing is with one button any CEO can know: Do they pay women the same as men? But are they willing to press that button?”

A March report by Glassdoor found that male computer programmers make an average of 28.3 percent more than female programmers.

“The fear comes from something simple: they don’t know,” Benioff explained to the audience of 15,000, 14,000 of them women. “They don’t know if they’re paying women the same as men, and if they find out there’s some major discrepancy, how much will it cost to make that change, and will it impact them in some dramatic way in their company?

“All of us together need to take away that fear,” he said. “We need to make that change.”

Benioff addressed tech companies’ responsibility to use their influence to improve equality for women and people of color in the workplace. “Business is a platform for change, and CEOs are the leaders of business that can make this change happen,” he said. “We have a room full of future CEOs here.”

Benioff aims to make that happen through setting an example with Salesforce. The company has a policy called 1:1:1 in which they leverage 1 percent of the company’s technology, resources and people to make change. When Salesforce acquires a company (it made $4 billion in acquisitions this year), he encourages leadership to adhere to same pay equality philosophy. Last month, Benioff hired the company’s first chief equality officer.

Last year, he also threatened to pull out of Indiana when Gov. Mike Pence approved a “religious freedom” bill that would have allowed discrimination against LGBTQ people.

To some criticism on social media, he spoke “colorfully” about his responsibility to represent his employees. “I’m from San Francisco, I’m married, I’m straight, I’m heterosexual,” Benioff said. “And I’m lesbian, I’m gay, I’m bisexual, I’m transgender, I’m queer. I’m all of our employees.

“I’m the whole rainbow,” he added. “I have to be. I have to represent everybody.”

Although some members of the audience applauded Benioff’s comments on Twitter, others thought he took the comments a step too far — or wondered why a white male was keynoting Grace Hopper. Megan Smith, chief technology officer of the United States, followed him.

“Sorry Marc Benioff, you don’t represent all of us. you may sympathize with those who are oppressed but you’re not oppressed yourself,” wrote Ling-Yi Kung.

Onstage, Benioff encouraged every attendee to do just one thing, anything, to push for equality. “Each and everyone of us has to decide what personal action we’re going to take to make the world more equal,” he said. “I’m not saying you have to do everything, but you need to do something.”

He wryly looked forward a Hillary Clinton presidency. “I’m not going to tell you who is going to win this election,” he said. “I’m just going to tell you what I’m going to tell her — that we need more equality.”

Photo: Benioff speaks with CNBC reporter Julia Boorstin at the Grace Hopper Celebration of Women in Computing in Houston

This story was written as part of a Women in Tech fellowship sponsored by the GroundTruth Project and SiliconANGLE Media’s theCUBE. Other stories reported from the Anita Borg Institute’s Grace Hopper Celebration of Women in Computing conference in Houston can be found at SiliconANGLE, the TechTruth Women in Tech site and the GroundTruth Project.